Method for multiplexing uplink control information in wireless communication system, and apparatus using same

ABSTRACT

A base station of a wireless communication is disclosed. A wireless communication base station comprises a communication module and a processor. The processor receives DCI of a physical downlink control channel (PDCCH) for scheduling a physical uplink shared channel (PUSCH) transmission over a plurality of slots and multiplexes hybrid automatic repeat request (HARQ)-ACK information to the PUSCH transmission by applying a value in a downlink assignment index (DAI) field of the DCI to each slot where the HARQ-ACK information is multiplexed to the PUSCH transmission over the plurality of slots.

TECHNICAL FIELD

The present invention relates to a wireless communication system.Specifically, the present invention relates to a method for multiplexinguplink control information in a wireless communication system and anapparatus using the same.

BACKGROUND ART

After commercialization of 4th generation (4G) communication system, inorder to meet the increasing demand for wireless data traffic, effortsare being made to develop new 5th generation (5G) communication systems.The 5G communication system is called as a beyond 4G networkcommunication system, a post LTE system, or a new radio (NR) system. Inorder to achieve a high data transfer rate, 5G communication systemsinclude systems operated using the millimeter wave (mmWave) band of 6GHz or more, and include a communication system operated using afrequency band of GHz or less in terms of ensuring coverage so thatimplementations in base stations and terminals are under consideration.

A 3rd generation partnership project (3GPP) NR system enhances spectralefficiency of a network and enables a communication provider to providemore data and voice services over a given bandwidth. Accordingly, the3GPP NR system is designed to meet the demands for high-speed data andmedia transmission in addition to supports for large volumes of voice.The advantages of the NR system are to have a higher throughput and alower latency in an identical platform, support for frequency divisionduplex (FDD) and time division duplex (TDD), and a low operation costwith an enhanced end-user environment and a simple architecture.

For more efficient data processing, dynamic TDD of the NR system may usea method for varying the number of orthogonal frequency divisionmultiplexing (OFDM) symbols that may be used in an uplink and downlinkaccording to data traffic directions of cell users. For example, whenthe downlink traffic of the cell is larger than the uplink traffic, thebase station may allocate a plurality of downlink OFDM symbols to a slot(or subframe). Information about the slot configuration should betransmitted to the terminals.

In order to alleviate the path loss of radio waves and increase thetransmission distance of radio waves in the mmWave band, in 5Gcommunication systems, beamforming, massive multiple input/output(massive MIMO), full dimensional MIMO (FD-MIMO), array antenna, analogbeam-forming, hybrid beamforming that combines analog beamforming anddigital beamforming, and large scale antenna technologies are discussed.In addition, for network improvement of the system, in the 5Gcommunication system, technology developments related to evolved smallcells, advanced small cells, cloud radio access network (cloud RAN),ultra-dense network, device to device communication (D2D), vehicle toeverything communication (V2X), wireless backhaul, non-terrestrialnetwork communication (NTN), moving network, cooperative communication,coordinated multi-points (CoMP), interference cancellation, and the likeare being made. In addition, in the 5G system, hybrid FSK and QAMmodulation (FQAM) and sliding window superposition coding (SWSC), whichare advanced coding modulation (ACM) schemes, and filter bankmulti-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparsecode multiple access (SCMA), which are advanced connectivitytechnologies, are being developed.

Meanwhile, in a human-centric connection network where humans generateand consume information, the Internet has evolved into the Internet ofThings (IoT) network, which exchanges information among distributedcomponents such as objects. Internet of Everything (IoE) technology,which combines IoT technology with big data processing technologythrough connection with cloud servers, is also emerging. In order toimplement IoT, technology elements such as sensing technology,wired/wireless communication and network infrastructure, serviceinterface technology, and security technology are required, so that inrecent years, technologies such as sensor network, machine to machine(M2M), and machine type communication (MTC) have been studied forconnection between objects. In the IoT environment, an intelligentinternet technology (IT) service that collects and analyzes datagenerated from connected objects to create new value in human life canbe provided. Through the fusion and mixture of existing informationtechnology (IT) and various industries, IoT can be applied to fieldssuch as smart home, smart building, smart city, smart car or connectedcar, smart grid, healthcare, smart home appliance, and advanced medicalservice.

Accordingly, various attempts have been made to apply the 5Gcommunication system to the IoT network. For example, technologies suchas a sensor network, a machine to machine (M2M), and a machine typecommunication (MTC) are implemented by techniques such as beamforming,MIMO, and array antennas. The application of the cloud RAN as the bigdata processing technology described above is an example of the fusionof 5G technology and IoT technology. Generally, a mobile communicationsystem has been developed to provide voice service while ensuring theuser's activity.

However, the mobile communication system is gradually expanding not onlythe voice but also the data service, and now it has developed to theextent of providing high-speed data service. However, in a mobilecommunication system in which services are currently being provided, amore advanced mobile communication system is required due to a shortagephenomenon of resources and a high-speed service demand of users.

DETAILED DESCRIPTION OF THE INVENTION Technical Problem

An objective of an embodiment of the present invention is to provide amethod for efficiently transmitting signals in a wireless communicationsystem and an apparatus therefor. In addition, another objective of anembodiment of the present invention is to provide a method formultiplexing uplink control information in a wireless communicationsystem and an apparatus using the same.

Technical Solution

A user equipment according to an embodiment of the present invention ina wireless communication system may include: a communication module; anda processor configured to control the communication module, wherein theprocessor is configured to receive DCI of a PDCCH (physical downlinkcontrol channel) scheduling transmission of a PUSCH (physical uplinkshared channel) over a plurality of slots, and multiplex the HARQ-ACKinformation to PUSCH transmission by applying a value of the downlinkassignment index (DAI) field of the DCI to each slot in which hybridautomatic repeat request (HARQ)-ACK information is multiplexed to PUSCHtransmission on the plurality of slots.

The processor may determine the number of bits of the HARQ-ACKinformation according to the value of the DAI field of the DCI in everyslot in which the HARQ-ACK information is multiplexed with the PUSCHtransmission over the plurality of slots.

the processor may determine the remainder obtained by dividing thenumber of bits of the HARQ-ACK information by 4 according to the valueof the DAI field of the DCI in every slot in which the HARQ-ACKinformation is multiplexed with the PUSCH transmission over theplurality of slots when a dynamic HARQ-ACK codebook is configured forthe user equipment.

The processor may not multiplex the HARQ-ACK information with the PUSCHtransmission in a slot in which the wireless communication userequipment is not to transmit the HARQ-ACK information together with aPUCCH (physical uplink control channel) when there is no PUSCHtransmission over the plurality of slots.

The processor may not multiplex the HARQ-ACK information with the PUSCHtransmission over the plurality of slots in a specific slot when thewireless communication user equipment fails to receive a PDSCH of whichthe successful or unsuccessful reception is indicated by HARQ-ACKinformation to be transmitted in the specific slot, which is one of theplurality of slots.

The processor may not multiplex the HARQ-ACK information with the PUSCHtransmission over the plurality of slots in a specific slot when thewireless communication user equipment fails to receive a PDCCHscheduling transmission of a PUCCH including HARQ-ACK information to betransmitted in the specific slot, which is one of the plurality ofslots.

The processor may multiplex the HARQ-ACK information, in which thesuccessful or unsuccessful reception of the PDSCH is configured as NACK,with the PUSCH transmission over the plurality of slots in the slotother than the slot indicated by a PDSCH-to-HARQ_feedback timingindicator field of DCI for scheduling PDSCH (physical uplink sharedchannel) transmission.

The processor may not multiplex the HARQ-ACK information with the PUSCHtransmission over the plurality of slots in the slot other than the slotindicated by a PDSCH-to-HARQ_feedback timing indicator field of DCI forscheduling a PDSCH (physical uplink shared channel).

the processor may multiplex the HARQ-ACK information with the PUSCHtransmission over the plurality of slots in a specific slot. Theprocessing timing condition may be determined according to a minimumtime required for the user equipment to receive the PDCCH and togenerate valid HARQ-ACK information when the specific slot, which is oneof the plurality of slots, satisfies a processing timing condition for aPDSCH (physical uplink shared channel) of which the successful orunsuccessful reception is indicated by the HARQ-ACK information and aPDCCH scheduling the PUCCH (physical uplink control channel)transmission including the HARQ-ACK information.

the processor may not multiplex the HARQ-ACK information with the PUSCHtransmission over the plurality of slots in a specific slot when thespecific slot, which is one of the plurality of slots, does not satisfya processing timing condition for a PDSCH of which the successful orunsuccessful reception is indicated by the HARQ-ACK information and aPDCCH scheduling the PUCCH transmission including the HARQ-ACKinformation.

the processor may set a bit of the HARQ-ACK information corresponding toa PDSCH that does not satisfy a processing timing condition to NACK whenthe specific slot, which is one of the plurality of slots, does notsatisfy the processing timing condition for a PDSCH of which thesuccessful or unsuccessful reception is indicated by the HARQ-ACKinformation and a PDCCH for scheduling the PUCCH transmission includingthe HARQ-ACK information.

The processor may determine the processing timing condition on the basisof the position of the latest symbol of a PDSCH of which the successfulor unsuccessful reception is indicated by the HARQ-ACK information andthe position of the earlier symbol of a start symbol of a PUCCHincluding the HARQ-ACK information and a start symbol of PUSCHtransmission over the plurality of slots.

A method of operating a user equipment in a wireless communicationsystem according to an embodiment of the present invention may includereceiving DCI of a PDCCH (physical downlink control channel) schedulingtransmission of PUSCH (physical uplink shared channel) transmission overa plurality of slots and multiplexing the HARQ-ACK information to PUSCHtransmission by applying a value of the downlink assignment index (DAI)field of the DCI to each slot in which hybrid automatic repeat request(HARQ)-ACK information is multiplexed to PUSCH transmission on theplurality of slot.

The multiplexing of the HARQ-ACK information may include determining thenumber of bits of the HARQ-ACK information according to the value of theDAI field of the DCI in every slot in which the HARQ-ACK information ismultiplexed with the PUSCH transmission over the plurality of slots.

The determining of the number of bits of the HARQ-ACK information mayinclude determining a remainder obtained by dividing the number of bitsof the HARQ-ACK information by 4 according to the value of the DAI fieldof the DCI in every slot in which the HARQ-ACK information ismultiplexed with the PUSCH transmission over the plurality of slots whena dynamic HARQ-ACK codebook is configured for the user equipment.

The multiplexing of the HARQ-ACK information may include notmultiplexing the HARQ-ACK information with the PUSCH transmission in aslot in which the wireless communication user equipment is not totransmit the HARQ-ACK information together with a PUCCH (physical uplinkcontrol channel) when there is no PUSCH transmission over the pluralityof slots.

The not multiplexing of the HARQ-ACK information may include notmultiplexing the HARQ-ACK information with the PUSCH transmission overthe plurality of slots in a specific slot when the wirelesscommunication user equipment fails to receive a PDSCH of which thesuccessful or unsuccessful reception is indicated by HARQ-ACKinformation to be transmitted in the specific slot, which is one of theplurality of slots.

The not multiplexing of the HARQ-ACK information may include notmultiplexing the HARQ-ACK information with the PUSCH transmission overthe plurality of slots in a specific slot when the wirelesscommunication user equipment fails to receive a PDCCH schedulingtransmission of a PUCCH including HARQ-ACK information to be transmittedin the specific slot, which is one of the plurality of slots,

The multiplexing of the HARQ-ACK information may include multiplexingthe HARQ-ACK information, in which the successful or unsuccessfulreception of the PDSCH is configured as NACK, with the PUSCHtransmission over the plurality of slots in the slot other than the slotindicated by a PDSCH-to-HARQ_feedback timing indicator field of DCI forscheduling PDSCH (physical uplink shared channel) transmission.

The multiplexing of the HARQ-ACK information may include notmultiplexing the HARQ-ACK information with the PUSCH transmission overthe plurality of slots in the slot other than the slot indicated by aPDSCH-to-HARQ_feedback timing indicator field of DCI for scheduling aPDSCH (physical uplink shared channel).

Advantageous Effects

An embodiment of the present invention provides a method for efficientlymultiplexing uplink control information in a wireless communicationsystem and an apparatus using the same.

The effects obtainable in the present invention are not limited to theabove-mentioned effects, and other effects not mentioned above may beclearly understood by those skilled in the art from the followingdescription.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example of a wireless frame structure used in awireless communication system.

FIG. 2 illustrates an example of a downlink (DL)/uplink (UL) slotstructure in a wireless communication system.

FIG. 3 is a diagram for explaining a physical channel used in a 3GPPsystem and a typical signal transmission method using the physicalchannel.

FIG. 4 illustrates an SS/PBCH block for initial cell access in a 3GPP NRsystem.

FIGS. 5A and 5B illustrate a procedure for transmitting controlinformation and a control channel in a 3GPP NR system.

FIG. 6 illustrates a control resource set (CORESET) in which a physicaldownlink control channel (PUCCH) may be transmitted in a 3GPP NR system.

FIG. 7 illustrates a method for configuring a PDCCH search space in a3GPP NR system.

FIG. 8 is a conceptual diagram illustrating carrier aggregation.

FIG. 9 is a diagram for explaining signal carrier communication andmultiple carrier communication.

FIG. 10 is a diagram showing an example in which a cross carrierscheduling technique is applied.

FIG. 11 is a block diagram illustrating configuration of a userequipment and a base station according to an embodiment of the presentinvention.

FIG. 12 illustrates an operation in which a user equipment multiplexesHARQ-ACK information with PUSCH transmission over a plurality of slotsaccording to an embodiment of the present invention.

FIG. 13 illustrates an operation in which a user equipment multiplexesHARQ-ACK information with PUSCH transmission over a plurality of slotsaccording to another embodiment of the present invention.

FIG. 14 illustrates an operation in which a user equipment multiplexesHARQ-ACK information with PUSCH transmission over a plurality of slotsaccording to another embodiment of the present invention.

FIG. 15 illustrates an operation in which a user equipment multiplexesHARQ-ACK information with PUSCH transmission over a plurality of slotsaccording to another embodiment of the present invention.

FIG. 16 illustrates a method in which a user equipment determineswhether or not multiplexing of HARQ-ACK information is enabled on thebasis of the latest symbol of a PDSCH of which the successful orunsuccessful reception is indicated by HARQ-ACK information and thelatest symbol of a PDCCH for scheduling a PUCCH including HARQ-ACKinformation when multiplexing HARQ-ACK information with PUSCHtransmission according to an embodiment of the present invention.

FIG. 17 illustrates a method in which a user equipment performsmultiplexing of HARQ-ACK information on the basis of HARQ-ACK timing andthe latest symbol of a PDSCH of which the successful or unsuccessfulreception is indicated by HARQ-ACK information when multiplexingHARQ-ACK information with PUSCH transmission according to an embodimentof the present invention.

FIG. 18 illustrates a method in which a user equipment performsmultiplexing of HARQ-ACK information on the basis of T_(proc,1) and thelatest symbol of a PDSCH of which the successful or unsuccessfulreception is indicated by HARQ-ACK information when multiplexingHARQ-ACK information with PUSCH transmission according to anotherembodiment of the present invention.

MODE FOR CARRYING OUT THE INVENTION

Terms used in the specification adopt general terms which are currentlywidely used as possible by considering functions in the presentinvention, but the terms may be changed depending on an intention ofthose skilled in the art, customs, and emergence of new technology.Further, in a specific case, there is a term arbitrarily selected by anapplicant and in this case, a meaning thereof will be described in acorresponding description part of the invention. Accordingly, it intendsto be revealed that a term used in the specification should be analyzedbased on not just a name of the term but a substantial meaning of theterm and contents throughout the specification.

Throughout this specification and the claims that follow, when it isdescribed that an element is “connected” to another element, the elementmay be “directly connected” to the other element or “electricallyconnected” to the other element through a third element. Further, unlessexplicitly described to the contrary, the word “comprise” will beunderstood to imply the inclusion of stated elements but not theexclusion of any other elements unless otherwise stated. Moreover,limitations such as “more than or equal to” or “less than or equal to”based on a specific threshold may be appropriately substituted with“more than” or “less than”, respectively, in some exemplary embodiments.

The following technology may be used in various wireless access systems,such as code division multiple access (CDMA), frequency divisionmultiple access (FDMA), time division multiple access (TDMA), orthogonalfrequency division multiple access (OFDMA), single carrier-FDMA(SC-FDMA), and the like. The CDMA may be implemented by a wirelesstechnology such as universal terrestrial radio access (UTRA) orCDMA2000. The TDMA may be implemented by a wireless technology such asglobal system for mobile communications (GSM)/general packet radioservice (GPRS)/enhanced data rates for GSM evolution (EDGE). The OFDMAmay be implemented by a wireless technology such as IEEE 802.11(Wi-Fi),IEEE 802.16(WiMAX), IEEE 802-20, evolved UTRA (E-UTRA), and the like.The UTRA is a part of a universal mobile telecommunication system(UMTS). 3rd generation partnership project (3GPP) long term evolution(LTE) is a part of an evolved UMTS (E-UMTS) using evolved-UMTSterrestrial radio access (E-UTRA) and LTE-advanced (A) is an evolvedversion of the 3GPP LTE. 3GPP new radio (NR) is a system designedseparately from LTE/LTE-A, and is a system for supporting enhancedmobile broadband (eMBB), ultra-reliable and low latency communication(URLLC), and massive machine type communication (mMTC) services, whichare requirements of IMT-2020. For the clear description, 3GPP NR ismainly described, but the technical idea of the present invention is notlimited thereto.

Unless otherwise specified in this specification, a base station mayrefer to a next generation node B (gNB) as defined in 3GPP NR.Furthermore, unless otherwise specified, a terminal may refer to a userequipment (UE). Hereinafter, although respective configurations will beseparately described as independent embodiments in order to assist inunderstanding the description, the respective embodiments may be used incombination with each other. In the disclosure, the configuration of aUE may indicate the configuration by a base station. Specifically, thebase station may transmit a channel or a signal to the UE so as toconfigure values of parameters used in the operation of the UE or awireless communication system.

FIG. 1 illustrates an example of a wireless frame structure used in awireless communication system.

Referring to FIG. 1, the wireless frame (or radio frame) used in the3GPP NR system may have a length of 10 ms (Δf_(max)N_(f)/100)*T_(c)). Inaddition, the wireless frame includes 10 subframes (SFs) having equalsizes. Herein, Δf_(max)=480*103 Hz, N_(f)=4096, T_(c)=1/(Δf_(ref)*Nf,ref), Δf_(ref)=15*103 Hz, and N_(f,ref)=2048. Numbers from 0 to 9 may berespectively allocated to 10 subframes within one wireless frame. Eachsubframe has a length of 1 ms and may include one or more slotsaccording to a subcarrier spacing. More specifically, in the 3GPP NRsystem, the subcarrier spacing that may be used is 15*2 μkHz, and p canhave a value of p=0, 1, 2, 3, 4 as subcarrier spacing configuration.That is, 15 kHz, 30 kHz, 60 kHz, 120 kHz and 240 kHz may be used forsubcarrier spacing. One subframe having a length of 1 ms may include 2μslots. In this case, the length of each slot is 2-μ ms. Numbers from 0to 2μ-1 may be respectively allocated to 2μ slots within one subframe.In addition, numbers from to 10*2μ−1 may be respectively allocated toslots within one wireless frame. The time resource may be distinguishedby at least one of a wireless frame number (also referred to as awireless frame index), a subframe number (also referred to as a subframeindex), and a slot number (or a slot index).

FIG. 2 illustrates an example of a downlink (DL)/uplink (UL) slotstructure in a wireless communication system. In particular, FIG. 2shows the structure of the resource grid of the 3GPP NR system.

There is one resource grid per antenna port. Referring to FIG. 2, a slotincludes a plurality of orthogonal frequency division multiplexing(OFDM) symbols in a time domain and includes a plurality of resourceblocks (RBs) in a frequency domain. An OFDM symbol also means one symbolsection. Unless otherwise specified, OFDM symbols may be referred tosimply as symbols. One RB includes 12 consecutive subcarriers in thefrequency domain. Referring to FIG. 2, a signal transmitted from eachslot may be represented by a resource grid including N^(size,μ)_(grid,x)*N^(RB) _(sc) subcarriers, and N^(slot) _(symb) OFDM symbols.Here, x=DL when the signal is a DL signal, and x=UL when the signal isan UL signal. N^(size,μ) _(grid,x) represents the number of resourceblocks (RBs) according to the subcarrier spacing constituent μ (x is DLor UL), and N^(slot) _(symb) represents the number of OFDM symbols in aslot. N^(RB) _(sc) is the number of subcarriers constituting one RB andN^(RB) _(sc)=12. An OFDM symbol may be referred to as a cyclic shiftOFDM (CP-OFDM) symbol or a discrete Fourier transform spread OFDM(DFT-s-OFDM) symbol according to a multiple access scheme.

The number of OFDM symbols included in one slot may vary according tothe length of a cyclic prefix (CP). For example, in the case of a normalCP, one slot includes 14 OFDM symbols, but in the case of an extendedCP, one slot may include 12 OFDM symbols. In a specific embodiment, theextended CP can only be used at 60 kHz subcarrier spacing. In FIG. 2,for convenience of description, one slot is configured with 14 OFDMsymbols by way of example, but embodiments of the present disclosure maybe applied in a similar manner to a slot having a different number ofOFDM symbols. Referring to FIG. 2, each OFDM symbol includes N^(size,μ)_(grid,x)*N^(RB) _(sc) subcarriers in the frequency domain. The type ofsubcarrier may be divided into a data subcarrier for data transmission,a reference signal subcarrier for transmission of a reference signal,and a guard band. The carrier frequency is also referred to as thecenter frequency (fc).

One RB may be defined by N^(RB) _(sc) (e.g., 12) consecutive subcarriersin the frequency domain. For reference, a resource configured with oneOFDM symbol and one subcarrier may be referred to as a resource element(RE) or a tone. Therefore, one RB can be configured with N^(slot,μ)_(symb)*N^(RB) _(sc) resource elements. Each resource element in theresource grid can be uniquely defined by a pair of indexes (k, 1) in oneslot. k may be an index assigned from 0 to N^(size,μ) _(grid,x)*N^(RB)_(sc)−1 in the frequency domain, and 1 may be an index assigned from 0to N^(slot) _(symb)−1 in the time domain.

In order for the UE to receive a signal from the base station or totransmit a signal to the base station, the time/frequency of the UE maybe synchronized with the time/frequency of the base station. This isbecause when the base station and the UE are synchronized, the UE candetermine the time and frequency parameters necessary for demodulatingthe DL signal and transmitting the UL signal at the correct time.

Each symbol of a radio frame used in a time division duplex (TDD) or anunpaired spectrum may be configured with at least one of a DL symbol, anUL symbol, and a flexible symbol. A radio frame used as a DL carrier ina frequency division duplex (FDD) or a paired spectrum may be configuredwith a DL symbol or a flexible symbol, and a radio frame used as a ULcarrier may be configured with a UL symbol or a flexible symbol. In theDL symbol, DL transmission is possible, but UL transmission isimpossible. In the UL symbol, UL transmission is possible, but DLtransmission is impossible. The flexible symbol may be determined to beused as a DL or an UL according to a signal.

Information on the type of each symbol, i.e., information representingany one of DL symbols, UL symbols, and flexible symbols, may beconfigured with a cell-specific or common radio resource control (RRC)signal. In addition, information on the type of each symbol mayadditionally be configured with a UE-specific or dedicated RRC signal.The base station informs, by using cell-specific RRC signals, i) theperiod of cell-specific slot configuration, ii) the number of slots withonly DL symbols from the beginning of the period of cell-specific slotconfiguration, iii) the number of DL symbols from the first symbol ofthe slot immediately following the slot with only DL symbols, iv) thenumber of slots with only UL symbols from the end of the period of cellspecific slot configuration, and v) the number of UL symbols from thelast symbol of the slot immediately before the slot with only the ULsymbol. Here, symbols not configured with any one of a UL symbol and aDL symbol are flexible symbols.

When the information on the symbol type is configured with theUE-specific RRC signal, the base station may signal whether the flexiblesymbol is a DL symbol or an UL symbol in the cell-specific RRC signal.In this case, the UE-specific RRC signal can not change a DL symbol or aUL symbol configured with the cell-specific RRC signal into anothersymbol type. The UE-specific RRC signal may signal the number of DLsymbols among the N^(slot) _(symb) symbols of the corresponding slot foreach slot, and the number of UL symbols among the N^(slot) _(symb)symbols of the corresponding slot. In this case, the DL symbol of theslot may be continuously configured with the first symbol to the i-thsymbol of the slot. In addition, the UL symbol of the slot may becontinuously configured with the j-th symbol to the last symbol of theslot (where i<j). In the slot, symbols not configured with any one of aUL symbol and a DL symbol are flexible symbols.

The type of symbol configured with the above RRC signal may be referredto as a semi-static DL/UL configuration. In the semi-static DL/ULconfiguration previously configured with RRC signals, the flexiblesymbol may be indicated as a DL symbol, an UL symbol, or a flexiblesymbol through dynamic slot format information (SFI) transmitted on aphysical DL control channel (PDCCH). In this case, the DL symbol or ULsymbol configured with the RRC signal is not changed to another symboltype. Table 1 exemplifies the dynamic SFI that the base station canindicate to the UE.

TABLE 1 Symbol number in a slot Index 0 1 2 3 4 5 6 7 8 9 10 11 12 13  0 D D D D D D D D D D D D D D   1 U U U U U U U U U U U U U U   2 X XX X X X X X X X X X X X   3 D D D D D D D D D D D D D X   4 D D D D D DD D D D D D X X   5 D D D D D D D D D D D X X X   6 D D D D D D D D D DX X X X   7 D D D D D D D D D X X X X X   8 X X X X X X X X X X X X X U  9 X X X X X X X X X X X X U U  10 X U U U U U U U U U U U U U  11 X XU U U U U U U U U U U U  12 X X X U U U U U U U U U U U  13 X X X X U UU U U U U U U U  14 X X X X X U U U U U U U U U  15 X X X X X X U U U UU U U U  16 D X X X X X X X X X X X X X  17 D D X X X X X X X X X X X X 18 D D D X X X X X X X X X X X  19 D X X X X X X X X X X X X U  20 D DX X X X X X X X X X X U  21 D D D X X X X X X X X X X U  22 D X X X X XX X X X X X U U  23 D D X X X X X X X X X X U U  24 D D D X X X X X X XX X U U  25 D X X X X X X X X X X U U U  26 D D X X X X X X X X X U U U 27 D D D X X X X X X X X U U U  28 D D D D D D D D D D D D X U  29 D DD D D D D D D D D X X U  30 D D D D D D D D D D X X X U  31 D D D D D DD D D D D X U U  32 D D D D D D D D D D X X U U  33 D D D D D D D D D XX X U U  34 D X U U U U U U U U U U U U  35 D D X U U U U U U U U U U U 36 D D D X U U U U U U U U U U  37 D X X U U U U U U U U U U U  38 D DX X U U U U U U U U U U  39 D D D X X U U U U U U U U U  40 D X X X U UU U U U U U U U  41 D D X X X U U U U U U U U U  42 D D D X X X U U U UU U U U  43 D D D D D D D D D X X X X U  44 D D D D D D X X X X X X U U 45 D D D D D D X X U U U U U U  46 D D D D D X U D D D D D X U  47 D DX U U U U D D X U U U U  48 D X U U U U U D X U U U U U  49 D D D D X XU D D D D X X U  50 D D X X U U U D D X X U U U  51 D X X U U U U D X XU U U U  52 D X X X X X U D X X X X X U  53 D D X X X X U D D X X X X U 54 X X X X X X X D D D D D D D  55 D D X X X U U U D D D D D D  56~Reserved 255

In Table 1, D denotes a DL symbol, U denotes a UL symbol, and X denotesa flexible symbol. As shown in Table 1, up to two DL/UL switching in oneslot may be allowed.

FIG. 3 is a diagram for explaining a physical channel used in a 3GPPsystem (e.g., NR) and a typical signal transmission method using thephysical channel.

If the power of the UE is turned on or the UE camps on a new cell, theUE performs an initial cell search (S101). Specifically, the UE maysynchronize with the BS in the initial cell search. For this, the UE mayreceive a primary synchronization signal (PSS) and a secondarysynchronization signal (SSS) from the base station to synchronize withthe base station, and obtain information such as a cell ID. Thereafter,the UE can receive the physical broadcast channel from the base stationand obtain the broadcast information in the cell.

Upon completion of the initial cell search, the UE receives a physicaldownlink shared channel (PDSCH) according to the physical downlinkcontrol channel (PDCCH) and information in the PDCCH, so that the UE canobtain more specific system information than the system informationobtained through the initial cell search (S102). Here, the systeminformation received by the UE is cell-common system information inorder for the UE to normally operate in the physical layer in radioresource control (RRC), and is referred to as “remaining systeminformation” or “system information block (SIB) 1”.

When the UE initially accesses the base station or does not have radioresources for signal transmission (When the UE is in RRC IDLE mode), theUE may perform a random access procedure on the base station (operationsS103 to S106). First, the UE can transmit a preamble through a physicalrandom access channel (PRACH) (S103) and receive a response message forthe preamble from the base station through the PDCCH and thecorresponding PDSCH (S104). When a valid random access response messageis received by the UE, the UE transmits data including the identifier ofthe UE and the like to the base station through a physical uplink sharedchannel (PUSCH) indicated by the UL grant transmitted through the PDCCHfrom the base station (S105). Next, the UE waits for reception of thePDCCH as an indication of the base station for collision resolution. Ifthe UE successfully receives the PDCCH through the identifier of the UE(S106), the random access process is terminated. The UE may obtainUE-specific system information necessary in order for the UE to normallyoperate in the physical layer in the RRC layer during the random accessprocess. If the UE obtains UE-specific system information from the RRClayer, the UE enters an RRC_CONNECTED mode.

The RRC layer is used to generate and manage messages for controlbetween a UE and a radio access network (RAN). More specifically, thebase station and the UE may perform broadcasting of cell systeminformation necessary for all UEs in the cell in the RRC layer,management of transmitting paging messages, mobility management andhandover, measurement report of a UE and control thereof, storagemanagement including UE capability management and existing management,and the like. In general, since the update of a signal transmitted inthe RRC layer (hereinafter, referred to as an “RRC signal”) is longerthan the transmission/reception period {i.e., a transmission timeinterval (TTI)} in the physical layer, the RRC signal is able to bemaintained unchanged for a long period.

After the above-described procedure, the UE receives PDCCH/PDSCH (S107)and transmits a physical uplink shared channel (PUSCH)/physical uplinkcontrol channel (PUCCH) (S108) as a general UL/DL signal transmissionprocedure. In particular, the UE may receive downlink controlinformation (DCI) through the PDCCH. The DCI may include controlinformation such as resource allocation information for the UE. Also,the format of the DCI may vary depending on the intended use. The uplinkcontrol information (UCI) that the UE transmits to the base stationthrough UL includes a DL/UL ACK/NACK signal, a channel quality indicator(CQI), a precoding matrix index (PMI), a rank indicator (RI), and thelike. Here, the CQI, PMI, and RI may be included in channel stateinformation (CSI). In the 3GPP NR system, the UE may transmit controlinformation such as HARQ-ACK and CSI described above through the PUSCHand/or PUCCH.

FIG. 4 illustrates an SS/PBCH block for initial cell access in a 3GPP NRsystem.

When the power is turned on or wanting to access a new cell, the UE mayobtain time and frequency synchronization with the cell and perform aninitial cell search procedure. The UE may detect a physical cellidentity N^(cell) _(ID) of the cell during a cell search procedure. Forthis, the UE may receive a synchronization signal, for example, aprimary synchronization signal (PSS) and a secondary synchronizationsignal (SSS), from a base station, and synchronize with the basestation. In this case, the UE can obtain information such as a cellidentity (ID).

Referring to FIG. 4A, a synchronization signal (SS) will be described inmore detail. The synchronization signal can be classified into PSS andSSS. The PSS may be used to obtain time domain synchronization and/orfrequency domain synchronization, such as OFDM symbol synchronizationand slot synchronization. The SSS can be used to obtain framesynchronization and cell group ID. Referring to FIG. 4A and Table 2, theSS/PBCH block can be configured with consecutive 20 RBs (=240subcarriers) in the frequency axis, and can be configured withconsecutive 4 OFDM symbols in the time axis. In this case, in theSS/PBCH block, the PSS is transmitted in the first OFDM symbol and theSSS is transmitted in the third OFDM symbol through the 56th to 182thsubcarriers. Here, the lowest subcarrier index of the SS/PBCH block isnumbered from 0. In the first OFDM symbol in which the PSS istransmitted, the base station does not transmit a signal through theremaining subcarriers, i.e., 0th to 55th and 183th to 239th subcarriers.In addition, in the third OFDM symbol in which the SSS is transmitted,the base station does not transmit a signal through 48th to 55th and183th to 191th subcarriers. The base station transmits a physicalbroadcast channel (PBCH) through the remaining RE except for the abovesignal in the SS/PBCH block.

TABLE 2 OFDM symbol Subcarrier number k number /relative to relative tothe start of Channel the start of an or signal SS/PBCH block an SS/PBCHblock PSS 0 56, 57, . . . , 182 SSS 2 56, 57, . . . , 182 Set to 0 0 0,1, . . . , 55, 183, 184, . . . , 239 2 48, 49, . . . , 55, 183, 184, . .. , 191 PBCH 1,3 0, 1, . . . , 239 2 0, 1, . . . , 47, 192, 193, . . . ,239 DM-RS for 1, 3 0 + v, 4 + v, 8 + v, . . . , 236 + v PBCH 2 0 + v,4 + v, 8 + v, . . . , 44 + v 192 + v, 196 + v, . . . , 236 + v

The SS allows a total of 1008 unique physical layer cell IDs to begrouped into 336 physical-layer cell-identifier groups, each groupincluding three unique identifiers, through a combination of three PSSsand SSSs, specifically, such that each physical layer cell ID is to beonly a part of one physical-layer cell-identifier group. Therefore, thephysical layer cell ID N^(cell) _(ID)=3N⁽¹⁾ _(ID)+N⁽²⁾ _(ID) can beuniquely defined by the index N⁽¹⁾ _(ID) ranging from 0 to 335indicating a physical-layer cell-identifier group and the index N⁽²⁾_(ID) ranging from 0 to 2 indicating a physical-layer identifier in thephysical-layer cell-identifier group. The UE may detect the PSS andidentify one of the three unique physical-layer identifiers. Inaddition, the UE can detect the SSS and identify one of the 336 physicallayer cell IDs associated with the physical-layer identifier. In thiscase, the sequence d_(PSS)(n) of the PSS is as follows.

d_(PSS)(n)=1−2x(m)

m=(n+43N_(IN) ⁽²⁾)mod 127

0≤n<127

Here, x(i+7)=(x(i+4)+x(i))mod 2 and is given as

[x(6) x(5) x(4) x(3) x(2) x(1) x(0)]=[1 1 1 0 1 1 0].

Further, the sequence d_(SSS)(n) of the SSS is as follows.

d_(SSS)(n) = [1 − 2x₀((n + m₀)mod 127)][1 − 2x₁((n + m₁)mod 127)]$m_{0} = {{15\lfloor \frac{N_{ID}^{(1)}}{112} \rfloor} + {5N_{ID}^{(2)}}}$m₁ = N_(ID)⁽¹⁾mod 112 0 ≤ n < 127

x₀(i+7)=(x₀(i+4)+x₀(i))mod 2

Here x₁(i+7)=(x₁(i+1)+x₁(i))mod 2 and is given as

[x₀(6) x₀(5) x₀(4) x₀(3) x₀(2) x₀(1) x₀(0)]=[0 0 0 0 0 0 1]

[x₁(6) x₁(5) x₁(4) x₁(3) x₁(2) x₁(1) x₁(0)]=[0 0 0 0 0 0 1]

A radio frame with a 10 ms length may be divided into two half frameswith a 5 ms length. Referring to FIG. 4B, a description will be made ofa slot in which SS/PBCH blocks are transmitted in each half frame. Aslot in which the SS/PBCH block is transmitted may be any one of thecases A, B, C, D, and E. In the case A, the subcarrier spacing is 15 kHzand the starting time point of the SS/PBCH block is the ({2, 8}+14*n)-thsymbol. In this case, n=0 or 1 at a carrier frequency of 3 GHz or less.In addition, it may be n=0, 1, 2, 3 at carrier frequencies above 3 GHzand below 6 GHz. In the case B, the subcarrier spacing is 30 kHz and thestarting time point of the SS/PBCH block is {4, 8, 16, 20}+28*n. In thiscase, n=0 at a carrier frequency of 3 GHz or less. In addition, it maybe n=0, 1 at carrier frequencies above 3 GHz and below 6 GHz. In thecase C, the subcarrier spacing is 30 kHz and the starting time point ofthe SS/PBCH block is the ({2, 8}+14*n)-th symbol. In this case, n=0 or 1at a carrier frequency of 3 GHz or less. In addition, it may be n=0, 1,2, 3 at carrier frequencies above 3 GHz and below 6 GHz. In the case D,the subcarrier spacing is 120 kHz and the starting time point of theSS/PBCH block is the ({4, 8, 16, 20}+28*n)-th symbol. In this case, at acarrier frequency of 6 GHz or more, n=0, 1, 2, 3, 5, 6, 7, 8, 10, 11,12, 13, 15, 16, 17, 18. In the case E, the subcarrier spacing is 240 kHzand the starting time point of the SS/PBCH block is the ({8, 12, 16, 20,32, 36, 40, 44}+56*n)-th symbol. In this case, at a carrier frequency of6 GHz or more, n=0, 1, 2, 3, 5, 6, 7, 8.

FIG. 5 illustrates a procedure for transmitting control information anda control channel in a 3GPP NR system. Referring to FIG. 5A, the basestation may add a cyclic redundancy check (CRC) masked (e.g., an XORoperation) with a radio network temporary identifier (RNTI) to controlinformation (e.g., downlink control information (DCI)) (S202). The basestation may scramble the CRC with an RNTI value determined according tothe purpose/target of each control information. The common RNTI used byone or more UEs can include at least one of a system information RNTI(SI-RNTI), a paging RNTI (P-RNTI), a random access RNTI (RA-RNTI), and atransmit power control RNTI (TPC-RNTI). In addition, the UE-specificRNTI may include at least one of a cell temporary RNTI (C-RNTI), and theCS-RNTI. Thereafter, the base station may perform rate-matching (S206)according to the amount of resource(s) used for PDCCH transmission afterperforming channel encoding (e.g., polar coding) (S204). Thereafter, thebase station may multiplex the DCI(s) based on the control channelelement (CCE) based PDCCH structure (S208). In addition, the basestation may apply an additional process (S210) such as scrambling,modulation (e.g., QPSK), interleaving, and the like to the multiplexedDCI(s), and then map the DCI(s) to the resource to be transmitted. TheCCE is a basic resource unit for the PDCCH, and one CCE may include aplurality (e.g., six) of resource element groups (REGs). One REG may beconfigured with a plurality (e.g., 12) of REs. The number of CCEs usedfor one PDCCH may be defined as an aggregation level. In the 3GPP NRsystem, an aggregation level of 1, 2, 4, 8, or 16 may be used. FIG. 5Bis a diagram related to a CCE aggregation level and the multiplexing ofa PDCCH and illustrates the type of a CCE aggregation level used for onePDCCH and CCE(s) transmitted in the control area according thereto.

FIG. 6 illustrates a control resource set (CORESET) in which a physicaldownlink control channel (PUCCH) may be transmitted in a 3GPP NR system.

The CORESET is a time-frequency resource in which PDCCH, that is, acontrol signal for the UE, is transmitted. In addition, a search spaceto be described later may be mapped to one CORESET. Therefore, the UEmay monitor the time-frequency domain designated as CORESET instead ofmonitoring all frequency bands for PDCCH reception, and decode the PDCCHmapped to CORESET. The base station may configure one or more CORESETsfor each cell to the UE. The CORESET may be configured with up to threeconsecutive symbols on the time axis. In addition, the CORESET may beconfigured in units of six consecutive PRBs on the frequency axis. Inthe embodiment of FIG. 5, CORESET #1 is configured with consecutivePRBs, and CORESET #2 and CORESET #3 are configured with discontinuousPRBs. The CORESET can be located in any symbol in the slot. For example,in the embodiment of FIG. 5, CORESET #1 starts at the first symbol ofthe slot, CORESET #2 starts at the fifth symbol of the slot, and CORESET#9 starts at the ninth symbol of the slot.

FIG. 7 illustrates a method for setting a PUCCH search space in a 3GPPNR system.

In order to transmit the PDCCH to the UE, each CORESET may have at leastone search space. In the embodiment of the present disclosure, thesearch space is a set of all time-frequency resources (hereinafter,PDCCH candidates) through which the PDCCH of the UE is capable of beingtransmitted. The search space may include a common search space that theUE of the 3GPP NR is required to commonly search and a Terminal-specificor a UE-specific search space that a specific UE is required to search.In the common search space, UE may monitor the PDCCH that is set so thatall UEs in the cell belonging to the same base station commonly search.In addition, the UE-specific search space may be set for each UE so thatUEs monitor the PDCCH allocated to each UE at different search spaceposition according to the UE. In the case of the UE-specific searchspace, the search space between the UEs may be partially overlapped andallocated due to the limited control area in which the PDCCH may beallocated. Monitoring the PDCCH includes blind decoding for PDCCHcandidates in the search space. When the blind decoding is successful,it may be expressed that the PDCCH is (successfully) detected/receivedand when the blind decoding fails, it may be expressed that the PDCCH isnot detected/not received, or is not successfully detected/received.

For convenience of explanation, a PDCCH scrambled with a group common(GC) RNTI previously known to one or more UEs so as to transmit DLcontrol information to the one or more UEs is referred to as a groupcommon (GC) PDCCH or a common PDCCH. In addition, a PDCCH scrambled witha specific-terminal RNTI that a specific UE already knows so as totransmit UL scheduling information or DL scheduling information to thespecific UE is referred to as a specific-UE PDCCH. The common PDCCH maybe included in a common search space, and the UE-specific PDCCH may beincluded in a common search space or a UE-specific PDCCH.

The base station may signal each UE or UE group through a PDCCH aboutinformation (i.e., DL Grant) related to resource allocation of a pagingchannel (PCH) and a downlink-shared channel (DL-SCH) that are atransmission channel or information (i.e., UL grant) related to resourceallocation of a uplink-shared channel (UL-SCH) and a hybrid automaticrepeat request (HARQ). The base station may transmit the PCH transportblock and the DL-SCH transport block through the PDSCH. The base stationmay transmit data excluding specific control information or specificservice data through the PDSCH. In addition, the UE may receive dataexcluding specific control information or specific service data throughthe PDSCH.

The base station may include, in the PDCCH, information on to which UE(one or a plurality of UEs) PDSCH data is transmitted and how the PDSCHdata is to be received and decoded by the corresponding UE, and transmitthe PDCCH. For example, it is assumed that the DCI transmitted on aspecific PDCCH is CRC masked with an RNTI of “A”, and the DCI indicatesthat PDSCH is allocated to a radio resource (e.g., frequency location)of “B” and indicates transmission format information (e.g., transportblock size, modulation scheme, coding information, etc.) of “C”. The UEmonitors the PDCCH using the RNTI information that the UE has. In thiscase, if there is a UE which performs blind decoding the PDCCH with the“A” RNTI, the UE receives the PDCCH, and receives the PDSCH indicated by“B” and “C” through the received PDCCH information.

Table 3 shows an embodiment of a physical uplink control channel (PUCCH)used in a wireless communication system.

TABLE 3 PUCCH format Length in OFDM symbols Number of bits 0 1-2 ≤2 14-14 ≤2 2 1-2 >2 3 4-14 >2 4 4-14 >2

PUCCH may be used to transmit the following UL control information(UCI).

Scheduling Request (SR): Information used for requesting a UL UL-SCHresource.

HARQ-ACK: A Response to PDCCH (indicating DL SPS release) and/or aresponse to DL transport block (TB) on PDSCH. HARQ-ACK indicates whetherinformation transmitted on the PDCCH or PDSCH is received. The HARQ-ACKresponse includes positive ACK (simply ACK), negative ACK (hereinafterNACK), Discontinuous Transmission (DTX), or NACK/DTX. Here, the termHARQ-ACK is used mixed with HARQ-ACK/NACK and ACK/NACK. In general, ACKmay be represented by bit value 1 and NACK may be represented by bitvalue 0.

Channel State Information (CSI): Feedback information on the DL channel.The UE generates it based on the CSI-Reference Signal (RS) transmittedby the base station. Multiple Input Multiple Output (MIMO)-relatedfeedback information includes a Rank Indicator (RI) and a PrecodingMatrix Indicator (PMI). CSI can be divided into CSI part 1 and CSI part2 according to the information indicated by CSI.

In the 3GPP NR system, five PUCCH formats may be used to support variousservice scenarios, various channel environments, and frame structures.

PUCCH format 0 is able to transmit 1 bit or 2 bits of HARQ-ACKinformation or SR. PUCCH format 0 may be transmitted through one or twoOFDM symbols on the time axis and one PRB on the frequency axis. WhenPUCCH format 0 is transmitted through two OFDM symbols, the samesequence may be transmitted through different RBs in the two symbols. Inthis case, the sequence may be a sequence that is cyclically shifted(CS) from a base sequence used in PUCCH format 0. According to this, theUE may obtain frequency diversity gain. Specifically, the UE maydetermine a cyclic shift (CS) value m_(cs) according to M_(bit) bits ofUCI (M_(bit)=1 or 2). In addition, the sequence obtained by cyclicallyshifting a base sequence having a length of 12 based on a predeterminedCS value m_(cs) may be mapped to one OFDM symbol and 12 REs of one RB,and may then be transmitted. In the case where the number of cyclicshifts available to the UE is 12 and M_(bit)=1, 1-bit UCI 0 and 1 may bemapped to two cyclically shifted sequences in which the differencebetween the cyclic shift values is 6, respectively. In addition, whenM_(bit)=2, 2 bits of UCI 00, 01, 11, and 10 may be mapped to fourcyclically shifted sequences in which the difference between the cyclicshift values is 3, respectively.

PUCCH format 1 may deliver 1-bit or 2-bit HARQ-ACK information or SR.PUCCH format 1 maybe transmitted through consecutive OFDM symbols on thetime axis and one PRB on the frequency axis. Here, the number of OFDMsymbols occupied by PUCCH format 1 may be one of 4 to 14. Morespecifically, UCI, which is M_(bit)=1, may be BPSK-modulated. The UE maymodulate UCI, which is M_(bit)=2, with quadrature phase shift keying(QPSK). A signal is obtained by multiplying a modulated complex valuedsymbol d(0) by a sequence of length 12. In this case, the sequence maybe a base sequence used for PUCCH format 0. The UE spreads theeven-numbered OFDM symbols to which PUCCH format 1 is allocated throughthe time axis orthogonal cover code (OCC) to transmit the obtainedsignal. PUCCH format 1 determines the maximum number of different UEsmultiplexed in the one RB according to the length of the OCC to be used.A demodulation reference signal (DMRS) may be spread with OCC and mappedto the odd-numbered OFDM symbols of PUCCH format 1.

PUCCH format 2 may deliver UCI exceeding 2 bits. PUCCH format 2 may betransmitted through one or two OFDM symbols on the time axis and one ora plurality of RBs on the frequency axis. When PUCCH format 2 istransmitted in two OFDM symbols, the sequences which are transmitted indifferent RBs through the two OFDM symbols may be same each other. Here,the sequence may be a plurality of modulated complex valued symbolsd(0), . . . , d(Msymbol-1). Here, M_(symbol) may be M_(bit)/2. Throughthis, the UE may obtain a frequency diversity gain. More specifically,M_(bit) bit UCI (M_(bit)>2) is bit-level scrambled, QPSK modulated, andmapped to RB(s) of one or two OFDM symbol(s). Here, the number of RBsmay be one of 1 to 16.

PUCCH format 3 or PUCCH format 4 may deliver UCI exceeding 2 bits. PUCCHformat 3 or PUCCH format 4 may be transmitted through consecutive OFDMsymbols on the time axis and one PRB on the frequency axis. The numberof OFDM symbols occupied by PUCCH format 3 or PUCCH format 4 may be oneof 4 to 14. Specifically, the UE modulates Mbit bits UCI (M_(bit)>2)with n/2-Binary Phase Shift Keying (BPSK) or QPSK to generate a complexvalued symbol d(0) to d(M_(symb)−1). Here, when using n/2-BPSK,M_(symb)=Mbit, and when using QPSK, M_(symb)=Mbit/2. The UE may notapply block-unit spreading to the PUCCH format 3. However, the UE mayapply block-unit spreading to one RB (i.e., 12 subcarriers) usingPreDFT-OCC of a length of such that PUCCH format 4 may have two or fourmultiplexing capacities. The UE performs transmit precoding (orDFT-precoding) on the spread signal and maps it to each RE to transmitthe spread signal.

In this case, the number of RBs occupied by PUCCH format 2, PUCCH format3, or PUCCH format 4 may be determined according to the length andmaximum code rate of the UCI transmitted by the UE. When the UE usesPUCCH format 2, the UE may transmit HARQ-ACK information and CSIinformation together through the PUCCH. When the number of RBs that theUE may transmit is greater than the maximum number of RBs that PUCCHformat 2, or PUCCH format 3, or PUCCH format 4 may use, the UE maytransmit only the remaining UCI information without transmitting someUCI information according to the priority of the UCI information.

PUCCH format 1, PUCCH format 3, or PUCCH format 4 may be configuredthrough the RRC signal to indicate frequency hopping in a slot. Whenfrequency hopping is configured, the index of the RB to be frequencyhopped may be configured with an RRC signal. When PUCCH format 1, PUCCHformat 3, or PUCCH format 4 is transmitted through N OFDM symbols on thetime axis, the first hop may have floor (N/2) OFDM symbols and thesecond hop may have ceiling(N/2) OFDM symbols.

PUCCH format 1, PUCCH format 3, or PUCCH format 4 may be configured tobe repeatedly transmitted in a plurality of slots. In this case, thenumber K of slots in which the PUCCH is repeatedly transmitted may beconfigured by the RRC signal. The repeatedly transmitted PUCCHs muststart at an OFDM symbol of the constant position in each slot, and havethe constant length. When one OFDM symbol among OFDM symbols of a slotin which a UE should transmit a PUCCH is indicated as a DL symbol by anRRC signal, the UE may not transmit the PUCCH in a corresponding slotand delay the transmission of the PUCCH to the next slot to transmit thePUCCH.

Meanwhile, in a 3GPP NR system, the UE may performtransmission/reception using a bandwidth less than or equal to thebandwidth of a carrier (or a cell). To this end, the UE may beconfigured with bandwidth parts (BWPs) including consecutive bandwidthsof a portion of the bandwidth of a carrier. The UE, which operatesaccording to TDD or operates in an unpaired spectrum, may be configuredwith up to 4 DL/UL BWP pairs for one carrier (or a cell). In addition,the UE may activate one DL/UL BWP pair. The UE, which operates accordingto FDD or operates in a paired spectrum, may be configured with up to 4DL BWPs in a downlink carrier (or cell), and may be configured with upto 4 UL BWPs in an uplink carrier (or cell). The UE may activate one DLBWP and UL BWP for each carrier (or cell). The UE may or may not performreception or transmission in time and frequency resources other than theactivated BWPs. The activated BWP may be referred to as an “active BWP”.

The base station may indicate an activated BWP, among the BWPs to beconfigured in the UE, through downlink control information (DCI). TheBWP indicated through the DCI is activated, and other configured BWPsare deactivated. In a carrier (or cell) operating in TDD, the basestation may include a BPI (bandwidth part indicator) indicating the BWPto be activated in the DCI for scheduling a PDSCH or PUSCH in order tochange the DL/UL BWP pair of the UE. The UE may receive DCI forscheduling a PDSCH or a PUSCH, and may identify a DL/UL BWP pair to beactivated based on the BPI. In the case of a downlink carrier (or cell)operating in FDD, the base station may include a BPI indicating the BWPto be activated in the DCI for scheduling a PDSCH in order to change theDL BWP of the UE. In the case of an uplink carrier (or cell) operatingin FDD, the base station may include a BPI indicating the BWP to beactivated in the DCI for scheduling a PUSCH in order to change the ULBWP of the UE.

FIG. 8 is a conceptual diagram illustrating carrier aggregation.

The carrier aggregation is a method in which the UE uses a plurality offrequency blocks or cells (in the logical sense) configured with ULresources (or component carriers) and/or DL resources (or componentcarriers) as one large logical frequency band in order for a wirelesscommunication system to use a wider frequency band. One componentcarrier may also be referred to as a term called a Primary cell (PCell)or a Secondary cell (SCell), or a Primary SCell (PScell). However,hereinafter, for convenience of description, the term “componentcarrier” is used.

Referring to FIG. 8, as an example of a 3GPP NR system, the entiresystem band may include up to 16 component carriers, and each componentcarrier may have a bandwidth of up to 400 MHz. The component carrier mayinclude one or more physically consecutive subcarriers. Although it isshown in FIG. 8 that each of the component carriers has the samebandwidth, this is merely an example, and each component carrier mayhave a different bandwidth. Also, although each component carrier isshown as being adjacent to each other in the frequency axis, thedrawings are shown in a logical concept, and each component carrier maybe physically adjacent to one another, or may be spaced apart.

Different center frequencies may be used for each component carrier.Also, one common center frequency may be used in physically adjacentcomponent carriers. Assuming that all the component carriers arephysically adjacent in the embodiment of FIG. 8, center frequency A maybe used in all the component carriers. Further, assuming that therespective component carriers are not physically adjacent to each other,center frequency A and the center frequency B can be used in each of thecomponent carriers.

When the total system band is extended by carrier aggregation, thefrequency band used for communication with each UE can be defined inunits of a component carrier. UE A may use 100 MHz, which is the totalsystem band, and performs communication using all five componentcarriers. UEs B₁˜B₅ can use only a 20 MHz bandwidth and performcommunication using one component carrier. UEs C₁ and C₂ may use a 40MHz bandwidth and perform communication using two component carriers,respectively. The two component carriers may be logically/physicallyadjacent or non-adjacent. UE C₁ represents the case of using twonon-adjacent component carriers, and UE C₂ represents the case of usingtwo adjacent component carriers.

FIG. 9 is a drawing for explaining signal carrier communication andmultiple carrier communication. Particularly, FIG. 9A shows a singlecarrier subframe structure and FIG. 9B shows a multi-carrier subframestructure.

Referring to FIG. 9A, in an FDD mode, a general wireless communicationsystem may perform data transmission or reception through one DL bandand one UL band corresponding thereto. In another specific embodiment,in a TDD mode, the wireless communication system may divide a radioframe into a UL time unit and a DL time unit in a time domain, andperform data transmission or reception through a UL/DL time unit.Referring to FIG. 9B, three 20 MHz component carriers (CCs) can beaggregated into each of UL and DL, so that a bandwidth of 60 MHz can besupported. Each CC may be adjacent or non-adjacent to one another in thefrequency domain. FIG. 9B shows a case where the bandwidth of the UL CCand the bandwidth of the DL CC are the same and symmetric, but thebandwidth of each CC can be determined independently. In addition,asymmetric carrier aggregation with different number of UL CCs and DLCCs is possible. A DL/UL CC allocated/configured to a specific UEthrough RRC may be called as a serving DL/UL CC of the specific UE.

The base station may perform communication with the UE by activatingsome or all of the serving CCs of the UE or deactivating some CCs. Thebase station can change the CC to be activated/deactivated, and changethe number of CCs to be activated/deactivated. If the base stationallocates a CC available for the UE as to be cell-specific orUE-specific, at least one of the allocated CCs may not be deactivated,unless the CC allocation for the UE is completely reconfigured or the UEis handed over. One CC that is not deactivated by the UE is called as aPrimary CC (PCC) or a primary cell (PCell), and a CC that the basestation can freely activate/deactivate is called as a Secondary CC (SCC)or a secondary cell (SCell).

Meanwhile, 3GPP NR uses the concept of a cell to manage radio resources.A cell is defined as a combination of DL resources and UL resources,that is, a combination of DL CC and UL CC. A cell may be configured withDL resources alone, or a combination of DL resources and UL resources.When the carrier aggregation is supported, the linkage between thecarrier frequency of the DL resource (or DL CC) and the carrierfrequency of the UL resource (or UL CC) may be indicated by systeminformation. The carrier frequency refers to the center frequency ofeach cell or CC. A cell corresponding to the PCC is referred to as aPCell, and a cell corresponding to the SCC is referred to as an SCell.The carrier corresponding to the PCell in the DL is the DL PCC, and thecarrier corresponding to the PCell in the UL is the UL PCC. Similarly,the carrier corresponding to the SCell in the DL is the DL SCC and thecarrier corresponding to the SCell in the UL is the UL SCC. According toUE capability, the serving cell(s) may be configured with one PCell andzero or more SCells. In the case of UEs that are in the RRC_CONNECTEDstate but not configured for carrier aggregation or that do not supportcarrier aggregation, there is only one serving cell configured only withPCell.

As mentioned above, the term “cell” used in carrier aggregation isdistinguished from the term “cell” which refers to a certaingeographical area in which a communication service is provided by onebase station or one antenna group. That is, one component carrier mayalso be referred to as a scheduling cell, a scheduled cell, a primarycell (PCell), a secondary cell (SCell), or a primary SCell (PScell).However, in order to distinguish between a cell referring to a certaingeographical area and a cell of carrier aggregation, in the presentdisclosure, a cell of a carrier aggregation is referred to as a CC, anda cell of a geographical area is referred to as a cell.

FIG. 10 is a diagram showing an example in which a cross carrierscheduling technique is applied. When cross carrier scheduling is set,the control channel transmitted through the first CC may schedule a datachannel transmitted through the first CC or the second CC using acarrier indicator field (CIF). The CIF is included in the DCI. In otherwords, a scheduling cell is set, and the DL grant/UL grant transmittedin the PDCCH area of the scheduling cell schedules the PDSCH/PUSCH ofthe scheduled cell. That is, a search area for the plurality ofcomponent carriers exists in the PDCCH area of the scheduling cell. APCell may be basically a scheduling cell, and a specific SCell may bedesignated as a scheduling cell by an upper layer.

In the embodiment of FIG. 10, it is assumed that three DL CCs aremerged. Here, it is assumed that DL component carrier #0 is DL PCC (orPCell), and DL component carrier #1 and DL component carrier #2 are DLSCCs (or SCell). In addition, it is assumed that the DL PCC is set tothe PDCCH monitoring CC. When cross-carrier scheduling is not configuredby UE-specific (or UE-group-specific or cell-specific) higher layersignaling, a CIF is disabled, and each DL CC can transmit only a PDCCHfor scheduling its PDSCH without the CIF according to an NR PDCCH rule(non-cross-carrier scheduling, self-carrier scheduling). Meanwhile, ifcross-carrier scheduling is configured by UE-specific (orUE-group-specific or cell-specific) higher layer signaling, a CIF isenabled, and a specific CC (e.g., DL PCC) may transmit not only thePDCCH for scheduling the PDSCH of the DL CC A using the CIF but also thePDCCH for scheduling the PDSCH of another CC (cross-carrier scheduling).On the other hand, a PDCCH is not transmitted in another DL CC.Accordingly, the UE monitors the PDCCH not including the CIF to receivea self-carrier scheduled PDSCH depending on whether the cross-carrierscheduling is configured for the UE, or monitors the PDCCH including theCIF to receive the cross-carrier scheduled PDSCH.

On the other hand, FIGS. 9 and 10 illustrate the subframe structure ofthe 3GPP LTE-A system, and the same or similar configuration may beapplied to the 3GPP NR system. However, in the 3GPP NR system, thesubframes of FIGS. 9 and 10 may be replaced with slots.

FIG. 11 is a block diagram showing the configurations of a UE and a basestation according to an embodiment of the present disclosure. In anembodiment of the present disclosure, the UE may be implemented withvarious types of wireless communication devices or computing devicesthat are guaranteed to be portable and mobile. The UE may be referred toas a User Equipment (UE), a Station (STA), a Mobile Subscriber (MS), orthe like. In addition, in an embodiment of the present disclosure, thebase station controls and manages a cell (e.g., a macro cell, a femtocell, a pico cell, etc.) corresponding to a service area, and performsfunctions of a signal transmission, a channel designation, a channelmonitoring, a self diagnosis, a relay, or the like. The base station maybe referred to as next Generation NodeB (gNB) or Access Point (AP).

As shown in the drawing, a UE 100 according to an embodiment of thepresent disclosure may include a processor 110, a communication module120, a memory 130, a user interface 140, and a display unit 150.

First, the processor 110 may execute various instructions or programsand process data within the UE 100. In addition, the processor 110 maycontrol the entire operation including each unit of the UE 100, and maycontrol the transmission/reception of data between the units. Here, theprocessor 110 may be configured to perform an operation according to theembodiments described in the present disclosure. For example, theprocessor 110 may receive slot configuration information, determine aslot configuration based on the slot configuration information, andperform communication according to the determined slot configuration.

Next, the communication module 120 may be an integrated module thatperforms wireless communication using a wireless communication networkand a wireless LAN access using a wireless LAN. For this, thecommunication module 120 may include a plurality of network interfacecards (NICs) such as cellular communication interface cards 121 and 122and an unlicensed band communication interface card 123 in an internalor external form. In the drawing, the communication module 120 is shownas an integral integration module, but unlike the drawing, each networkinterface card can be independently arranged according to a circuitconfiguration or usage.

The cellular communication interface card 121 may transmit or receive aradio signal with at least one of the base station 200, an externaldevice, and a server by using a mobile communication network and providea cellular communication service in a first frequency band based on theinstructions from the processor 110. According to an embodiment, thecellular communication interface card 121 may include at least one NICmodule using a frequency band of less than 6 GHz. At least one NICmodule of the cellular communication interface card 121 mayindependently perform cellular communication with at least one of thebase station 200, an external device, and a server in accordance withcellular communication standards or protocols in the frequency bandsbelow 6 GHz supported by the corresponding NIC module.

The cellular communication interface card 122 may transmit or receive aradio signal with at least one of the base station 200, an externaldevice, and a server by using a mobile communication network and providea cellular communication service in a second frequency band based on theinstructions from the processor 110. According to an embodiment, thecellular communication interface card 122 may include at least one NICmodule using a frequency band of more than 6 GHz. At least one NICmodule of the cellular communication interface card 122 mayindependently perform cellular communication with at least one of thebase station 200, an external device, and a server in accordance withcellular communication standards or protocols in the frequency bands of6 GHz or more supported by the corresponding NIC module.

The unlicensed band communication interface card 123 transmits orreceives a radio signal with at least one of the base station 200, anexternal device, and a server by using a third frequency band which isan unlicensed band, and provides an unlicensed band communicationservice based on the instructions from the processor 110. The unlicensedband communication interface card 123 may include at least one NICmodule using an unlicensed band. For example, the unlicensed band may bea band of 2.4 GHz or 5 GHz. At least one NIC module of the unlicensedband communication interface card 123 may independently or dependentlyperform wireless communication with at least one of the base station200, an external device, and a server according to the unlicensed bandcommunication standard or protocol of the frequency band supported bythe corresponding NIC module.

The memory 130 stores a control program used in the UE 100 and variouskinds of data therefor. Such a control program may include a prescribedprogram required for performing wireless communication with at least oneamong the base station 200, an external device, and a server.

Next, the user interface 140 includes various kinds of input/outputmeans provided in the UE 100. In other words, the user interface 140 mayreceive a user input using various input means, and the processor 110may control the UE 100 based on the received user input. In addition,the user interface 140 may perform an output based on instructions fromthe processor 110 using various kinds of output means.

Next, the display unit 150 outputs various images on a display screen.The display unit 150 may output various display objects such as contentexecuted by the processor 110 or a user interface based on controlinstructions from the processor 110.

In addition, the base station 200 according to an embodiment of thepresent disclosure may include a processor 210, a communication module220, and a memory 230.

First, the processor 210 may execute various instructions or programs,and process internal data of the base station 200. In addition, theprocessor 210 may control the entire operations of units in the basestation 200, and control data transmission and reception between theunits. Here, the processor 210 may be configured to perform operationsaccording to embodiments described in the present disclosure. Forexample, the processor 210 may signal slot configuration and performcommunication according to the signaled slot configuration.

Next, the communication module 220 may be an integrated module thatperforms wireless communication using a wireless communication networkand a wireless LAN access using a wireless LAN. For this, thecommunication module 120 may include a plurality of network interfacecards such as cellular communication interface cards 221 and 222 and anunlicensed band communication interface card 223 in an internal orexternal form. In the drawing, the communication module 220 is shown asan integral integration module, but unlike the drawing, each networkinterface card can be independently arranged according to a circuitconfiguration or usage.

The cellular communication interface card 221 may transmit or receive aradio signal with at least one of the base station 100, an externaldevice, and a server by using a mobile communication network and providea cellular communication service in the first frequency band based onthe instructions from the processor 210. According to an embodiment, thecellular communication interface card 221 may include at least one NICmodule using a frequency band of less than 6 GHz. The at least one NICmodule of the cellular communication interface card 221 mayindependently perform cellular communication with at least one of thebase station 100, an external device, and a server in accordance withthe cellular communication standards or protocols in the frequency bandsless than 6 GHz supported by the corresponding NIC module.

The cellular communication interface card 222 may transmit or receive aradio signal with at least one of the base station 100, an externaldevice, and a server by using a mobile communication network and providea cellular communication service in the second frequency band based onthe instructions from the processor 210. According to an embodiment, thecellular communication interface card 222 may include at least one NICmodule using a frequency band of 6 GHz or more. The at least one NICmodule of the cellular communication interface card 222 mayindependently perform cellular communication with at least one of thebase station 100, an external device, and a server in accordance withthe cellular communication standards or protocols in the frequency bands6 GHz or more supported by the corresponding NIC module.

The unlicensed band communication interface card 223 transmits orreceives a radio signal with at least one of the base station 100, anexternal device, and a server by using the third frequency band which isan unlicensed band, and provides an unlicensed band communicationservice based on the instructions from the processor 210. The unlicensedband communication interface card 223 may include at least one NICmodule using an unlicensed band. For example, the unlicensed band may bea band of 2.4 GHz or 5 GHz. At least one NIC module of the unlicensedband communication interface card 223 may independently or dependentlyperform wireless communication with at least one of the base station100, an external device, and a server according to the unlicensed bandcommunication standards or protocols of the frequency band supported bythe corresponding NIC module.

FIG. 11 is a block diagram illustrating the UE 100 and the base station200 according to an embodiment of the present disclosure, and blocksseparately shown are logically divided elements of a device.Accordingly, the aforementioned elements of the device may be mounted ina single chip or a plurality of chips according to the design of thedevice. In addition, a part of the configuration of the UE 100, forexample, a user interface 140, a display unit 150 and the like may beselectively provided in the UE 100. In addition, the user interface 140,the display unit 150 and the like may be additionally provided in thebase station 200, if necessary.

If PUSCH transmission and PUCCH transmission including UCI overlap eachother in any one slot, the UE may transmit a PUSCH together with uplinkcontrol information (UCI). Specifically, the UE may multiplex UCI withPUSCH transmission. In a specific embodiment, the UE may multiplexhybrid automatic repeat request (HARQ)-ACK information with PUSCHtransmission. At this time, the UE may multiplex HARQ-ACK informationwith PUSCH transmission on the basis of the value of a UL-DAI (downlinkassignment index) field. In this specification, the HARQ-ACK informationindicates whether or not a PDSCH is successfully received. Specifically,the HARQ-ACK information may include one or more bits indicating thesuccessful or unsuccessful reception of a PDSCH, and each beat mayrepresent ACK or NACK.

A downlink assignment index (DAI) indicates information on the number ofHARQ-ACKs included in a hybrid automatic repeat request (HARQ)-ACKcodebook in which the UE indicates the successful or unsuccessfulreception of a plurality of PDSCHs to the base station. The UE mayreceive a DAI through a PDCCH for scheduling a PDSCH. Specifically, theDAI may be classified into a counter-DAI and a total-DAI. The total-DAIindicates the number of PDSCHs transmitted through the same HARQ-ACKcodebook. The counter-DAI indicates the sequence of a PDSCH among thePDSCHs indicated by the same total-DAI. The DCI for scheduling a PDSCHmay include a value of the counter-DAI corresponding to the scheduledPDSCH. In addition, the DCI for scheduling a PDSCH may include a valueof the total-DAI corresponding to the scheduled PDSCH.

If a dynamic HARQ-ACK codebook is configured for the UE, the DCI forscheduling a PUSCH may include a 2-bit or 4-bit UL-DAI field. In thisspecification, the UL-DAI field indicates a DAI field of DCI forscheduling PUSCH transmission. If TBG (transport block group)-basedtransmission is configured, the DCI for scheduling a PUSCH may include a2-bit UL-DAI field. In the following description, “UL-DAI field”indicates the UL-DAI field of DCI for scheduling a PUSCH, unless statedotherwise. If CBG (code block group)-based transmission is configured,the DCI for scheduling a PUSCH may include a 4-bit UL-DAI field. Thevalue of the 2-bit UL-DAI field may indicate the remainder obtained bydividing the number of PDSCHs, of which the successful or unsuccessfulreception is indicated by the HARQ-ACK information to be multiplexedwith PUSCH transmission, by 4. In a specific embodiment, if the value ofthe 2-bit UL-DAI field is 0 (i.e., 00_(b)), the value of the 2-bitUL-DAI field may indicate that the remainder obtained by dividing thenumber of PDSCHs, of which the successful or unsuccessful reception isindicated by the HARQ-ACK information to be multiplexed with PUSCHtransmission, by 4 is 1 (e.g., the number of PDSCHs of which thesuccessful or unsuccessful reception is indicated by the HARQ-ACKinformation is 1, 5, 9, . . . ). In addition, in a specific embodiment,if the value of the 2-bit UL-DAI field is 1 (i.e., 01_(b)), the value ofthe 2-bit UL-DAI field may indicate that the remainder obtained bydividing the number of PDSCHs, of which the successful or unsuccessfulreception is indicated by the HARQ-ACK information to be multiplexedwith PUSCH transmission, by 4 is 2 (e.g., the number of PDSCHs of whichthe successful or unsuccessful reception is indicated by the HARQ-ACKinformation is 2, 6, 10, . . . ). In addition, in a specific embodiment,if the value of the 2-bit UL-DAI field is 2 (i.e., 10_(b)), the value ofthe 2-bit UL-DAI field may indicate that the remainder obtained bydividing the number of PDSCHs, of which the successful or unsuccessfulreception is indicated by the HARQ-ACK information to be multiplexedwith PUSCH transmission, by 4 is 3 (e.g., the number of PDSCHs of whichthe successful or unsuccessful reception is indicated by the HARQ-ACKinformation is 3, 7, 11, . . . ). Further, if the value of the 2-bitUL-DAI field is 3 (i.e., 11_(b)), the value of the 2-bit UL-DAI fieldmay indicate that the remainder obtained by dividing the number ofPDSCHs, of which the successful or unsuccessful reception is indicatedby the HARQ-ACK information to be multiplexed with PUSCH transmission,by 4 is 0 (e.g., the number of PDSCHs of which the successful orunsuccessful reception is indicated by the HARQ-ACK information is 0, 4,8, . . . ).

If there is no HARQ-ACK information to be transmitted by the UE in theslot in which PUSCH transmission is performed, the UE may not multiplexHARQ-ACK information with PUSCH transmission according to the value of aUL-DAI field. For example, if a dynamic HARQ-ACK codebook is configuredfor the UE, if the value of a UL-DAI field is 3 (i.e., 11_(b)), and ifthere is no HARQ-ACK information to be transmitted by the UE in the slotin which PUSCH transmission is performed, the UE may not multiplexHARQ-ACK information with PUSCH transmission. If the UE fails to receiveany of the PDSCHs for scheduling TB-based transmission in the slot inwhich PUSCH transmission is performed, the UE may determine that thereis no HARQ-ACK information on the TB-based transmission performed by theUE in the slot in which the PUSCH transmission is performed. The 2-bittotal-DAI for CBG-based transmission may have a specific value, and theUE may fail to receive any of the PDSCHs for scheduling the CBG-basedtransmission in the slot in which PUSCH transmission is performed. Atthis time, the UE may determine that there is no HARQ-ACK information onthe CBG-based transmission to be performed by the UE in the slot inwhich PUSCH transmission is performed. If the UE determines that thereis no HARQ-ACK information on the TB-based transmission and no HARQ-ACKinformation on the CBG-based transmission, which are to be transmittedby the UE, in the slot in which PUSCH transmission is performed, the UEmay not multiplex HARQ-ACK information with PUSCH transmission even ifPUSCH transmission and PUCCH transmission including HARQ-ACK informationoverlap each other. If the value of the 2-bit UL-DAI of DCI forscheduling a PUSCH is 3 (11_(b) in binary numbers), and if no DCI forscheduling a PDSCH corresponding to the HARQ-ACK included in PUCCHtransmission, which overlaps PUSCH transmission in the time domain, isreceived, the UE may not multiplex HARQ-ACK information with PUSCHtransmission.

In addition, when multiplexing HARQ-ACK information with PUSCHtransmission, the UE may determine whether or not to multiplex theHARQ-ACK information with the PUSCH transmission on the basis of thevalue of a UL (uplink)-DAI field of DCI for scheduling a PUSCH.Specifically, if a semi-static HARQ-ACK codebook is configured for theUE, the DCI for scheduling a PUSCH may include a 1-bit UL-DAI field. Atthis time, the value of the 1-bit UL-DAI field may indicate whether ornot HARQ-ACK information is multiplexed with PUSCH transmission. If thevalue of the 1-bit value UL-DAI field is 0, the UE may not multiplexHARQ-ACK information with PUSCH transmission, which is scheduled by theDCI. In addition, if the value of the 1-bit UL-DAI field is 1, the UEmay multiplex HARQ-ACK information with PUSCH transmission, which isscheduled by the DCI. In this embodiment, the number of bits of theHARQ-ACK information is determined according to a method predeterminedbetween the UE and the base station.

The UE may transmit a PUSCH over a plurality of slots. Specifically, theUE may repeatedly transmit a PUSCH in a plurality of slots. At thistime, the UE may transmit a PUSCH in 2, 4, or 8 slots. As describedabove, repeated transmission of a PUSCH by the UE in a plurality ofslots may be referred to as “slot aggregation”. In this specification,repeated transmission of a PUSCH may indicate transmission of a PUSCHincluding a plurality of the same TBs or repeated transmission of aPUSCH including one TB. For the convenience of description, a unit ofrepetition including the same TB in a PUSCH will be referred to as a“repetition unit”. The base station may inform the UE of informationindicating a first PUSCH transmission or a time domain of transmissionin a repetition unit included in PUSCH transmission, and the number ofrepetitions. The UE may repeatedly transmit a PUSCH on the basis ofinformation indicating the first PUSCH transmission or the time domainof a repetition unit and the number of repetitions. In another specificembodiment, the base station may indicate, to the UE, time and frequencyallocation information on each PUSCH transmission or repetition unit.The UE may repeatedly transmit a PUSCH according to the indicated timeand frequency resource allocation information. If the UE transmits aPUSCH over a plurality of slots, and if PUSCH transmission and PUCCHtransmission including UCI (e.g., HARQ-ACK information) overlap in theslot in which the PUSCH is transmitted, the UE may multiplex the UCIwith the PUSCH transmission, thereby transmitting the PUSCH.

When the UE transmits a PUSCH over a plurality of slots, there may be aproblem with a method in which the UE multiplexes UCI with PUSCHtransmission. For example, there may be a problem with a method in whichthe UE determines whether or not to multiplex HARQ-ACK information withPUSCH transmission in each of a plurality of slots in which a PUSCH istransmitted. In addition, when the UE multiplexes HARQ-ACK informationwith PUSCH transmission, there may be a problem with a method in whichthe UE applies the value of a UL-DAI field in each of a plurality ofslots. Specifically, when the UE multiplexes HARQ-ACK information withPUSCH transmission, there may be a problem with a method in which the UEdetermines the number of bits of HARQ-ACK information in each of aplurality of slots. In addition, even if the UE repeats PUSCHtransmission in one slot, there may be a problem with a method ofmultiplexing HARQ-ACK information with the PUSCH transmission. Forexample, there may be a problem with a method in which the UE determineswhether or not to multiplex HARQ-ACK information with PUSCH transmissionin each of a plurality of units. In addition, when the UE multiplexesHARQ-ACK information with PUSCH transmission, there may be a problemwith a method in which the UE applies the value of a UL-DAI field ineach of a plurality of repetition units. Specifically, when the UEmultiplexes HARQ-ACK information with PUSCH transmission, there may be aproblem with a method in which the UE determines the number of bits ofHARQ-ACK information in each of a plurality of repetition units. Adetailed method of multiplexing HARQ-ACK information with PUSCHtransmission will be described with reference to FIGS. 12 to 18. Inaddition, in this specification, multiplexing may indicate“piggybacking”. Piggybacking and multiplexing may be usedinterchangeably with each other.

FIG. 12 illustrates an operation in which a UE multiplexes HARQ-ACKinformation with PUSCH transmission in a plurality of slots according toan embodiment of the present invention.

The UE may not multiplex HARQ-ACK information with PUSCH transmission inthe slot in which the UE is not to transmit HARQ-ACK informationtogether with a PUCCH if PUSCH transmission is absent. Specifically, theUE may determine whether or not to multiplex HARQ-ACK with PUSCHtransmission for each of a plurality of slots in which the PUSCHtransmission is performed. At this time, if the UE fails to receive aPDCCH or a PDSCH corresponding to HARQ-ACK information to be transmittedin a specific slot, the UE may not multiplex HARQ-ACK information withPUSCH transmission in the corresponding slot. The PDCCH corresponding tothe HARQ-ACK information to be transmitted in the corresponding slot maybe a PDCCH including DCI for scheduling a PUCCH including HARQ-ACKinformation, which is to be transmitted in the corresponding slot.However, if PDSCH transmission does not need to be scheduled through aPDCCH, such as an SPS PDSCH, the UE may not determine whether or not toreceive the PDCCH corresponding to HARQ-ACK information. Even if thePDSCH transmission does not need to be scheduled through a PDCCH, andeven if the UE fails to receive a PDCCH corresponding to HARQ-ACKinformation, the UE may receive a PDSCH corresponding to the HARQ-ACKinformation. At this time, the UE may multiplex the HARQ-ACK informationwith PUSCH transmission. In addition, the PDSCH corresponding toHARQ-ACK information to be transmitted in a corresponding slot may be aPDSCH indicating the successful or unsuccessful reception of HARQ-ACK tobe transmitted in the corresponding slot. The PDCCH or PDSCHcorresponding to HARQ-ACK information to be transmitted in acorresponding slot may be a PDCCH or PDSCH satisfying HARQ-ACK timingfor the corresponding slot. The HARQ-ACK timing is indicated by DCI forscheduling a PDSCH, and indicates the number of slots between the slotincluding the latest symbol of a corresponding PDSCH and the slotincluding a PUCCH transmitting HARQ-ACK. In the embodiments describedabove, if the UE multiplexes HARQ-ACK information with PUSCHtransmission in any one of a plurality of slots in which the PUSCHtransmission is performed, and if the UE fails to receive a PDCCHcorresponding to HARQ-ACK information to be transmitted in another slot,the UE may not multiplex the HARQ-ACK information with the PUSCHtransmission in the another slot. The number of bits of the HARQ-ACKinformation multiplexed with the PUSCH transmission in each slot may bedetermined according to the value of a UL-DAI field of a PDCCH forscheduling PUSCH transmission.

In the embodiment shown in FIG. 12, PUSCH transmission is performed inthe first slot (slot n) to the fourth slot (slot n+3). The UEmultiplexes HARQ-ACK information with PUSCH transmission in each of thefirst slot (slot n) and the second slot (slot n+1). At this time, thePUSCH transmission in the first slot (slot n) overlaps transmission of afirst PUCCH (PUCCH1) including HARQ-ACK information indicating thesuccessful or unsuccessful reception of a first PDSCH (PDSCH1), a secondPDSCH (PDSCH2), and a third PDSCH (PDSCH3). In addition, the PUSCHtransmission in the second slot (slot n+1) overlaps transmission of asecond PUCCH (PUCCH2) including HARQ-ACK information indicating thesuccessful or unsuccessful reception of a fourth PDSCH (PDSCH4). The UEmultiplexes the HARQ-ACK information indicating the successful orunsuccessful reception of the first PDSCH (PDSCH1), the second PDSCH(PDSCH2), and the third PDSCH (PDSCH3) with the PUSCH transmission inthe first slot (slot n). In addition, the UE multiplexes the HARQ-ACKinformation indicating the successful or unsuccessful reception of thefourth PDSCH (PDSCH4) with the PUSCH transmission in the second slot(slot n+1). The UE is unable to receive a PDCCH or a PDSCH correspondingto the HARQ-ACK information to be transmitted in each of the third slot(slot n+2) and the fourth slot (slot n+3). Accordingly, the UE does notmultiplex HARQ-ACK information with PUSCH transmission in the third slot(slot n+2) and the fourth slot (slot n+3).

In the case where a PUSCH is repeatedly transmitted in one slot, theembodiments described above may be applied based on a repetition unitrather than a slot. The UE may not multiplex HARQ-ACK information withPUSCH transmission in a repetition unit in which the UE is not totransmit HARQ-ACK information together with a PUCCH if PUSCHtransmission is absent. Specifically, the UE may determine whether ornot to multiplex HARQ-ACK with PUSCH transmission in each of a pluralityof repetition units. At this time, if the UE fails to receive a PDCCHcorresponding to HARQ-ACK information to be transmitted in a specificrepetition unit, the UE may not multiplex HARQ-ACK information withPUSCH transmission in the corresponding repetition unit. In theembodiments described above, if the UE multiplexes HARQ-ACK informationwith PUSCH transmission in any one of a plurality of repetition units,and if the UE fails to receive a PDCCH or a PDSCH corresponding toHARQ-ACK information to be transmitted in another repetition unit, theUE may not multiplex HARQ-ACK information with PUSCH transmission in theanother repetition unit. The number of bits of the HARQ-ACK informationmultiplexed with the PUSCH transmission in each repetition unit may bedetermined according to the value of a UL-DAI field of a PDCCH forscheduling PUSCH transmission.

FIG. 13 illustrates an operation in which a UE multiplexes HARQ-ACKinformation with PUSCH transmission in a plurality of slots according toanother embodiment of the present invention.

In another specific embodiment, the UE may determine whether or not tomultiplex HARQ-ACK information with PUSCH transmission in all of aplurality of slots in which PUSCH transmission is performed.Specifically, the UE may determine to multiplex HARQ-ACK informationwith PUSCH transmission in all of a plurality of slots in which PUSCHtransmission is performed, or may determine to not multiplex HARQ-ACKinformation with PUSCH transmission in all of a plurality of slots inwhich PUSCH transmission is performed. If a semi-static HARQ-ACKcodebook is configured, and if the value of a UL-DAI field is 1, the UEmay multiplex HARQ-ACK with PUSCH transmission in all of a plurality ofslots in which PUSCH transmission is performed. In addition, if asemi-static HARQ-ACK codebook is configured, and if the value of aUL-DAI field is 0, the UE may not multiplex HARQ-ACK with PUSCHtransmission in all of a plurality of slots in which PUSCH transmissionis performed. In this embodiment, the HARQ-ACK information multiplexedwith PUSCH transmission in the respective slots may indicate thesuccessful or unsuccessful reception of different PDSCHs. If asemi-static HARQ-ACK codebook is configured, a set of PDSCHscorresponding to HARQ-ACK to be transmitted in one slot may be defined,and the same PDSCH may be included in the sets of PDSCHs correspondingto the HARQ-ACK to be transmitted in different slots. Specifically, theset of PDSCHs (referred to as a “DL association set”), of which thesuccessful or unsuccessful reception is indicated by the respectivepieces of HARQ-ACK information multiplexed with the PUSCH transmissionin the respective slots, may be determined to be disjointed from eachother. Here, determining the set of PDSCHs to be disjointed indicatesthat a first set of PDSCHs transmitted with HARQ-ACK in one slot and asecond set of PDSCHs transmitted with HARQ-ACK in another slot do notinclude the same PDSCH. For example, the HARQ-ACK informationmultiplexed in a subsequent slot may not indicate the successful orunsuccessful reception of a PDSCH that is indicated as to the successfulor unsuccessful reception thereof by the HARQ-ACK informationmultiplexed with the PUSCH transmission in a preceding slot. In thiscase, since the HARQ-ACK information multiplexed in the preceding slotis not redundantly multiplexed with the PUSCH transmission in thesubsequent slot, UCI overhead on the PUSCH may be reduced.

In the embodiment shown in FIG. 13, PUSCH transmission is performed inthe first slot (slot n) and the second slot (slot n+1). The PUSCHtransmission overlaps PUCCH transmission with HARQ-ACK information inthe first slot (slot n) and the second slot (slot n+1). The DLassociation set in the transmission of a first PUCCH (PUCCH1)overlapping PUSCH transmission in the first slot (slot n) includes afirst PDSCH (PDSCH1) to a third PDSCH (PDSCH3). At this time, the DLassociation set is a set of PDSCHs of which the successful orunsuccessful reception is indicated by the HARQ-ACK information includedin the PUCCH. The DL association set in the transmission of a secondPUCCH (PUCCH2) overlapping PUSCH transmission in the second slot (slotn+1) includes a second PDSCH (PDSCH2) to a fourth PDSCH (PDSCH4). The UEmultiplexes the HARQ-ACK information indicating the successful orunsuccessful reception of each of the first PDSCH (PDSCH1), the secondPDSCH (PDSCH2), and the third PDSCH (PDSCH3) with the PUSCH transmissionin the first slot (slot n). In addition, the UE multiplexes the HARQ-ACKinformation indicating the successful or unsuccessful reception of thefourth PDSCH (PDSCH4) with the PUSCH transmission in the second slot(slot n+1). This is due to the fact that the HARQ-ACK informationindicating the successful or unsuccessful reception of the second PDSCH(PDSCH2) and the third PDSCH (PDSCH3) is multiplexed with the PUSCHtransmission in the first slot (slot n).

In the case where a PUSCH is repeatedly transmitted in one slot, theembodiments described above may be applied based on a repetition unitrather than a slot. The UE may determine whether or not to multiplexHARQ-ACK information with PUSCH transmission in all of a plurality ofrepetition units. Specifically, the UE may determine to multiplexHARQ-ACK information with PUSCH transmission in all of a plurality ofrepetition units, or may determine to not multiplex HARQ-ACK informationwith PUSCH transmission in all of a plurality of repetition units. If asemi-static HARQ-ACK codebook is configured, and if the value of aUL-DAI field is 1, the UE may multiplex HARQ-ACK with PUSCH transmissionin all of a plurality of repetition units. In addition, if a semi-staticHARQ-ACK codebook is configured, and if the value of a UL-DAI field is0, the UE may not multiplex HARQ-ACK with PUSCH transmission in all of aplurality of repetition units. In this embodiment, the HARQ-ACKinformation multiplexed with the PUSCH transmission in the respectiveslots may indicate the successful or unsuccessful reception of differentPDSCHs. If a semi-static HARQ-ACK codebook is configured, a set ofPDSCHs corresponding to HARQ-ACK transmitted in one slot may be defined,and the same PDSCH may be included in the sets of PDSCHs correspondingto HARQ-ACK transmitted in different slots. Specifically, the set ofPDSCHs, of which the successful or unsuccessful reception is indicatedby the respective pieces of HARQ-ACK information multiplexed with thePUSCH transmission in the respective repetition units, may be determinedto be disjointed from each other. Here, determining the set of PDSCHs tobe disjointed indicates that a first set of PDSCHs transmitted withHARQ-ACK in one slot and a second set of PDSCHs transmitted withHARQ-ACK in another slot do not include the same PDSCH. For example, theHARQ-ACK information multiplexed in a subsequent repetition unit may notindicate the successful or unsuccessful reception of a PDSCH that isindicated as to the successful or unsuccessful reception thereof by theHARQ-ACK information multiplexed with the PUSCH transmission in apreceding repetition unit.

FIGS. 14 and 15 illustrate operations in which a UE multiplexes HARQ-ACKinformation with PUSCH transmission over a plurality of slots accordingto another embodiment of the present invention.

In another specific embodiment, if overlapping of PUCCH transmissionwith HARQ-ACK information occurs in at least one of a plurality of slotsin which PUSCH transmission is performed, the UE may aggregate HARQ-ACKinformation of all PUCCH transmissions overlapping the PUSCHtransmission. At this time, the UE may multiplex, with PUSCHtransmission, the HARQ-ACK information aggregated in any of theplurality of slots in which PUSCH transmission is performed.Specifically, if the value of a UL-DAI field for scheduling PUSCHtransmission is 1, the UE may aggregate HARQ-ACK information of allPUCCH transmissions overlapping PUSCH transmission, and may multiplex,with the PUSCH transmission, the HARQ-ACK information aggregated in anyone of the plurality of slots in which PUSCH transmission is performed.In the embodiments above, any one slot may be the latest slot among theslots in which PUSCH transmission is performed. In another embodiment,any one slot may be the latest slot among the slots in which PUSCHtransmission and PUCCH transmission with HARQ-ACK information overlapeach other. In addition, any one slot may be the earliest slot among theslots in which PUSCH transmission is performed. In another embodiment,any one slot may be the earliest slot among the slots in which PUSCHtransmission and PUCCH transmission with HARQ-ACK information overlapeach other.

In the embodiment shown in FIG. 14, PUSCH transmission is performed inthe first slot (slot n) and the second slot (slot n+1). The PUSCHtransmission overlaps PUCCH transmission with HARQ-ACK information inthe first slot (slot n) and the second slot (slot n+1). The DLassociation set in the transmission of a first PUCCH (PUCCH1)overlapping PUSCH transmission in the first slot (slot n) includes afirst PDSCH (PDSCH1) to a third PDSCH (PDSCH3). The DL association setin the transmission of a second PUCCH (PUCCH2) overlapping PUSCHtransmission in the second slot (slot n+1) includes a second PDSCH(PDSCH2) to a fourth PDSCH (PDSCH4). The UE multiplexes the HARQ-ACKinformation indicating the successful or unsuccessful reception of eachof the first PDSCH (PDSCH1), the second PDSCH (PDSCH2), and the thirdPDSCH (PDSCH3) and the fourth PDSCH (PDSCH4) with PUSCH transmission inthe second slot (slot n+1).

In the embodiment shown in FIG. 15, PUSCH transmission is performed inthe first slot (slot n) to the fourth slot (slot n+3). Specifically,PUSCH transmission is repeatedly performed in every slot from the firstslot (slot n) to the fourth slot (slot n+3). PUSCH transmission overlapsPUCCH transmission with HARQ-ACK information in the first slot (slot n)and the third slot (slot n+2). The UE aggregates PDSCHs corresponding tothe HARQ-ACK information transmitted with a PUCCH transmitted in thefirst slot (slot n) and the HARQ-ACK information transmitted with aPUCCH transmitted in the third slot (slot n+2). The UE multiplexes theHARQ-ACK information of the aggregated PDSCHs with PUSCH transmission inthe third slot (slot n+2), which is the latest slot among the slots inwhich PUSCH transmission and PUCCH transmission with HARQ-ACKinformation overlap.

In the case where a PUSCH is repeatedly transmitted in one slot, theembodiments described above may be applied based on a repetition unitrather than a slot. If overlapping of PUCCH transmission with HARQ-ACKinformation occurs in any one of a plurality of repetition units, the UEmay aggregate PDSCHs of the HARQ-ACK information of all PUCCHtransmissions overlapping PUSCH transmission. At this time, the UE maymultiplex, with PUSCH transmission, the HARQ-ACK information of theaggregated PDSCHs in any one of the plurality of repetition units.Specifically, if the value of a UL-DAI field for scheduling PUSCHtransmission is 1, the UE may aggregate PDSCHs corresponding to HARQ-ACKinformation of all PUCCH transmissions overlapping PUSCH transmission,and may multiplex, with PUSCH transmission, the HARQ-ACK information ofthe aggregated PDSCHs in any one of the plurality of repetition units.In the embodiments above, any one repetition unit may be the latestrepetition unit among a plurality of repetition units. In anotherembodiment, any one repetition unit may be the latest repetition unitamong a plurality of repetition units. In addition, in any one slot, anyone repetition unit may be the earliest repetition unit among aplurality of repetition units. In another embodiment, in any one slot,any one repetition unit may be the earliest repetition unit among theplurality of repetition units.

In another specific embodiment, the UE may aggregate PDSCHscorresponding to the HARQ-ACK information of all PUCCH transmissionsoverlapping PUSCH transmission, and may repeatedly multiplex theHARQ-ACK information of the aggregated PDSCHs with PUSCH transmissionfor every slot in a plurality of slots in which PUSCH transmission isperformed. Specifically, the UE may repeatedly transmit the HARQ-ACKinformation of the aggregated PDSCHs for every slot in all of the slotsin which PUSCH transmission is performed. In another specificembodiment, the UE may repeatedly multiplex the HARQ-ACK information ofthe aggregated PDSCHs with PUSCH transmission in every slot in whichoverlapping of PUCCH transmission with HARQ-ACK information occurs amonga plurality of slots in which PUSCH transmission is performed. Inanother specific embodiment, the UE may repeatedly multiplex theHARQ-ACK information of the aggregated PDSCHs with PUSCH transmission inevery slot from the earliest slot, in which overlapping of PUCCHtransmission with HARQ-ACK information occurs, to the latest slot, inwhich overlapping of PUCCH transmission with HARQ-ACK informationoccurs, among a plurality of slots in which PUSCH transmission isperformed. In another specific embodiment, the UE may repeatedlymultiplex the HARQ-ACK information of the aggregated PDSCHs with PUSCHtransmission in every slot from the earliest slot, in which overlappingof PUCCH transmission with HARQ-ACK information occurs, to the latestslot, in which PUSCH transmission is performed, among a plurality ofslots in which PUSCH transmission is performed. In another specificembodiment, the UE may repeatedly multiplex the HARQ-ACK information ofthe aggregated PDSCHs with PUSCH transmission in every slot from thelatest slot, in which overlapping of PUCCH transmission with HARQ-ACKinformation occurs, to the latest slot, in which PUSCH transmission isperformed, among a plurality of slots in which PUSCH transmission isperformed.

In the case where a PUSCH is repeatedly transmitted in one slot, theembodiments described above may be applied based on a repetition unitrather than a slot. The UE may aggregate PDSCHs of HARQ-ACK informationof all PUCCH transmissions overlapping PUSCH transmission, and mayrepeatedly multiplex the HARQ-ACK information of the aggregated PDSCHswith PUSCH transmission for every repetition unit in a plurality ofrepetition units. Specifically, the UE may repeatedly transmit theHARQ-ACK information of the aggregated PDSCHs for every repetition unitin all of the repetition units in which PUSCH transmission is performed.In another specific embodiment, the UE may repeatedly multiplex theHARQ-ACK information of the aggregated PDSCHs with PUSCH transmission inevery repetition unit in which overlapping of PUCCH transmission withHARQ-ACK information occurs, among a plurality of repetition units. Inanother specific embodiment, the UE may repeatedly multiplex theHARQ-ACK information of the aggregated PDSCHs with PUSCH transmission inevery repetition unit from the earliest repetition unit, in whichoverlapping of PUCCH transmission with HARQ-ACK information occurs, tothe latest slot, in which overlapping of PUCCH transmission withHARQ-ACK information occurs, among a plurality of repetition units. Inanother specific embodiment, the UE may repeatedly multiplex theHARQ-ACK information of the aggregated PDSCHs with the PUSCHtransmission in every repetition unit from the earliest repetition unit,in which overlapping of PUCCH transmission with HARQ-ACK informationoccurs, to the latest repetition unit, in which PUSCH transmission isperformed, among a plurality of repetition units. In another specificembodiment, the UE may repeatedly multiplex the HARQ-ACK information ofthe aggregated PDSCHs with PUSCH transmission in every repetition unitfrom the latest repetition unit, in which overlapping of PUCCHtransmission with HARQ-ACK information occurs, to the latest repetitionunit, in which PUSCH transmission is performed, among a plurality ofrepetition units.

When the base station schedules PUSCH transmission over a plurality ofslots, the base station may schedule PUSCH transmission or PUCCHtransmission so that the number of slots in which the correspondingPUSCH transmission and the PUCCH transmission overlap each other is lessthan or equal to a specific number. When PUSCH transmission is performedover a plurality of slots, the UE may assume that corresponding PUSCHtransmission and PUCCH transmission may overlap in a specific number ofslots or less. That is, when PUSCH transmission is performed in aplurality of slots, the UE may assume that the corresponding PUSCHtransmission and PUCCH transmission are unable to overlap in a number ofslots exceeding a specific number. Here, the specific number may be 1.Specifically, if PUSCH transmission is performed in a plurality ofslots, the UE may expect that the maximum number of slots in which thePUSCH transmission and PUCCH transmission overlap is 1. If a semi-staticHARQ-ACK codebook is configured, the UE may determine that it indicateswhether or not there is a PDSCH in which the value of a UL-DAI field ofDCI for scheduling a PUSCH corresponds to one PUCCH transmission. Inthis embodiment, the slot in which PUSCH transmission and PUCCHtransmission overlap may be the latest slot among the slots in whichPUSCH transmission is performed. In another specific embodiment, theslot in which PUSCH transmission and PUCCH transmission with HARQ-ACKoverlap may be the earliest (first) slot among the slots in which PUSCHtransmission is performed. In another specific embodiment, the slot inwhich PUSCH transmission and PUCCH transmission with HARQ-ACK overlapmay be the earliest slot among the slots in which PUSCH transmission andPUCCH transmission overlap. In another specific embodiment, the slot inwhich PUSCH transmission and PUCCH transmission with HARQ-ACK overlapmay be the latest slot among the slots in which PUSCH transmission andPUCCH transmission overlap.

In the case where a PUSCH is repeatedly transmitted in one slot, theembodiments described above may be applied based on a repetition unitrather than a slot. The base station may schedule PUSCH transmission orPUCCH transmission so that the number of repetition units in whichcorresponding PUSCH transmission and PUCCH transmission overlap is lessthan or equal to a specific number. When PUSCH transmission is performedin a plurality of repetition units, the UE may assume that correspondingPUSCH transmission and PUCCH transmission may overlap in a specificnumber of repetition units or less. That is, when PUSCH transmission isperformed in a plurality of repetition units, the UE may assume thatcorresponding PUSCH transmission and PUCCH transmission are unable tooverlap in a number of repetition units exceeding a specific number.Here, the specific number may be 1. Specifically, if PUSCH transmissionis performed in a plurality of repetition units, the UE may expect thatthe maximum number of repetition units in which PUSCH transmission andPUCCH transmission overlap is 1. If a semi-static HARQ-ACK codebook isconfigured, the UE may determine that the value of a UL-DAI field of DCIfor scheduling a PUSCH indicates multiplexing of PUCCH transmission withone HARQ-ACK. In this embodiment, the repetition unit in which PUSCHtransmission and PUCCH transmission overlap may be the latest repetitionunit among the repetition units in which PUSCH transmission isperformed. In another specific embodiment, the repetition unit in whichPUSCH transmission and PUCCH transmission with HARQ-ACK overlap may bethe earliest (first) repetition unit among the repetition units in whichPUSCH transmission is performed. In another specific embodiment, therepetition unit in which PUSCH transmission and PUCCH transmission withHARQ-ACK overlap may be the earliest repetition unit among therepetition units in which PUSCH transmission and PUCCH transmissionoverlap. In another specific embodiment, the repetition unit in whichPUSCH transmission and PUCCH transmission with HARQ-ACK overlap may bethe latest repetition unit among the repetition units in which PUSCHtransmission and PUCCH transmission overlap.

When PUSCH transmission is performed in a plurality of slots, the PUSCHtransmission may be performed in a plurality of discontinuous slots.This is due to the fact that the PUSCH transmission is able to beperformed only in the symbol that is configured as a flexible symbol ora UL symbol through an RRC signal. Specifically, the UE may performPUSCH transmission in the symbol configured as a DL symbol through anRRC signal. Accordingly, if any one of the symbols in which the PUSCH isscheduled is configured as a DL symbol by an RRC signal in a specificslot, the UE is unable to transmit the PUSCH in the corresponding slot.The RRC signal configuring the symbol as a UL symbol, a flexible symbol,or a DL symbol may be at least one of tdd-UL-DL-CnofigurationCommon andtdd-UL-DL-ConfigurationDedicated. If PUSCH transmission is performed ina plurality of discontinuous slots, the maximum number of slots in whichPUSCH transmission and PUCCH transmission overlap may be determinedbased on the number of consecutive slots. Specifically, consecutiveslots among the slots in which PUSCH transmission and PUCCH transmissionoverlap are counted as one. In addition, if the slots are notconsecutive, other consecutive slots are counted. A slot chunk indicatesa set of consecutive slots in which PUSCH transmission is performed. Forexample, PUSCH transmission may be performed in the first slot (slot n),the second slot (slot n+1), and the fourth slot (slot n+3), whereasPUSCH transmission is unable to be performed in the third slot (slotn+2) because it overlaps one or more DL symbols. In this case, thenumber of slot chunks is 2. At this time, the UE may aggregate PDSCHscorresponding to HARQ-ACK information together with PUCCH transmissionoverlapping PUSCH transmission, and may multiplex the HARQ-ACKinformation of the aggregated PDSCHs with PUSCH transmission in thelatest slot chunk.

According to the embodiments described above, a method in which the UEapplies the value of a UL-DAI field to the multiplexing of HARQ-ACKinformation when multiplexing HARQ-ACK information with PUSCHtransmission in a plurality of slots will be described. The UE maydetermine whether or not to multiplex HARQ-ACK information with PUSCHtransmission by applying the value of a UL-DAI field of DCI forscheduling corresponding PUSCH transmission to every slot in whichHARQ-ACK information is multiplexed with PUSCH transmission.Specifically, the UE may determine whether or not to performmultiplexing of HARQ-ACK information and the number of bits of HARQ-ACKinformation according to the value of a UL-DAI field in every slot inwhich HARQ-ACK information is multiplexed with PUSCH transmission. Forexample, PUSCH transmission may be performed in 4 slots, and the UE maydetermine whether or not to multiplex HARQ-ACK information with PUSCHtransmission in 4 slots. At this time, the UE may determine whether ornot to multiplex HARQ-ACK information and the number of bits of HARQ-ACKinformation to be multiplexed in each of the 4 slots on the basis of thevalue of a UL-DAI field. The number of PDSCHs of which the successful orunsuccessful reception is indicated by the HARQ-ACK informationmultiplexed with PUSCH transmission in the first slot is N1, the numberof PDSCHs of which the successful or unsuccessful reception is indicatedby the HARQ-ACK information multiplexed with PUSCH transmission in thesecond slot is N2, the number of PDSCHs of which the successful orunsuccessful reception is indicated by the HARQ-ACK informationmultiplexed with PUSCH transmission in the third slot is N3, and thenumber of PDSCHs of which the successful or unsuccessful reception isindicated by the HARQ-ACK information multiplexed with PUSCHtransmission in the fourth slot is N4. At this time, the UE may assumethat the remainder obtained by dividing each of N1, N2, N3, and N4 by 4is the value indicated by the value of a UL-DAI field. For example, ifthe value of a UL-DAI field indicates 0 (00_(b)), the UE may determinethat the remainder obtained by dividing the number of PDSCHscorresponding to the HARQ-ACK multiplexed in each of the first slot, thesecond slot, the third slot, and the fourth slot by 4 is 1 (i.e., thenumber of PDSCHs corresponding to the HARQ-ACK is any one of 1, 5, 9, .. . ). If the value of a UL-DAI field indicates 1 (01_(b)), the UE maydetermine that the remainder obtained by dividing the number of PDSCHscorresponding to the HARQ-ACK multiplexed in each of the first slot, thesecond slot, the third slot, and the fourth slot by 4 is (i.e., thenumber of PDSCHs corresponding to the HARQ-ACK is any one of 2, 6, 10, .. . ). If the value of a UL-DAI field indicates 2 (10_(b)), the UE maydetermine that the remainder obtained by dividing the number of PDSCHscorresponding to the HARQ-ACK multiplexed in each of the first slot, thesecond slot, the third slot, and the fourth slot by 4 is 3 (i.e., thenumber of PDSCHs corresponding to the HARQ-ACK is any one of 3, 7, 11, .. . ). If the value of a UL-DAI field indicates 3 (11_(b)), the UE maydetermine that the remainder obtained by dividing the number of PDSCHscorresponding to the HARQ-ACK multiplexed in each of the first slot, thesecond slot, the third slot, and the fourth slot by 4 is (i.e., thenumber of PDSCHs corresponding to the HARQ-ACK is any one of 0, 4, 8, .. . ). The number of PDSCHs corresponding to the HARQ-ACK multiplexedmay differ between the slots. In addition, as shown in the embodimentdescribed with reference to FIG. 13, the UE may determine whether or notto multiplex HARQ-ACK information with PUSCH transmission in all of aplurality of slots in which PUSCH transmission is performed. Even inthis case, the UE may multiplex HARQ-ACK information with PUSCHtransmission by applying the value of a UL-DAI field to every slot inwhich HARQ-ACK information is multiplexed with PUSCH transmission.Specifically, even if there is no PDSCH corresponding to HARQ-ACKinformation of PUCCH transmission in a specific slot, the UE maymultiplex HARQ-ACK information with PUSCH transmission in thecorresponding slot.

In the case where a PUSCH is repeatedly transmitted in one slot, theembodiments described above may be applied based on a repetition unitrather than a slot. The UE may determine whether or not to multiplexHARQ-ACK information with PUSCH transmission by applying the value of aUL-DAI field of DCI for scheduling corresponding PUSCH transmission toevery repetition unit in which HARQ-ACK information is multiplexed withPUSCH transmission. Specifically, the UE may determine whether or not toperform multiplexing of HARQ-ACK information and the number of bits ofHARQ-ACK information according to the value of a UL-DAI field in everyrepetition unit in which HARQ-ACK information is multiplexed with PUSCHtransmission. For example, PUSCH transmission may be performed in 4repetition units, and the UE may determine whether or not to multiplexHARQ-ACK information with PUSCH transmission in 4 repetition units. Atthis time, the UE may determine whether or not to perform multiplexingof HARQ-ACK information and the number of bits of HARQ-ACK informationto be multiplexed in each of the 4 repetition units on the basis of thevalue of a UL-DAI field. The number of PDSCHs of which the successful orunsuccessful reception is indicated by the HARQ-ACK informationmultiplexed with PUSCH transmission in the first repetition unit is N1,the number of PDSCHs of which the successful or unsuccessful receptionis indicated by the HARQ-ACK information multiplexed with PUSCHtransmission in the second repetition unit is N2, the number of PDSCHsof which the successful or unsuccessful reception is indicated by theHARQ-ACK information multiplexed with PUSCH transmission in the thirdrepetition unit is N3, and the number of PDSCHs of which the successfulor unsuccessful reception is indicated by the HARQ-ACK informationmultiplexed with PUSCH transmission in the fourth repetition unit is N4.At this time, the UE may assume that the remainder obtained by dividingeach of N1, N2, N3, and N4 by 4 is the value indicated by the value of aUL-DAI field. For example, if the value of a UL-DAI field indicates 0(00_(b)), the UE may determine that the remainder obtained by dividingthe number of PDSCHs corresponding to the HARQ-ACK multiplexed in thefirst repetition unit, the second repetition unit, the third repetitionunit, and the fourth repetition unit by 4 is 1 (i.e., the number ofPDSCHs corresponding to the HARQ-ACK is any one of 1, 5, 9, . . . ). Ifthe value of a UL-DAI field indicates 1 (01_(b)), the UE may determinethat the remainder obtained by dividing the number of PDSCHscorresponding to the HARQ-ACK multiplexed in each of the firstrepetition unit, the second repetition unit, the third repetition unit,and the fourth repetition unit by 4 is 2 (i.e., the number of PDSCHscorresponding to the HARQ-ACK is any one of 2, 6, 10, . . . ). If thevalue of a UL-DAI field indicates 2 (10_(b)), the UE may determine thatthe remainder obtained by dividing the number of PDSCHs corresponding tothe HARQ-ACK multiplexed in the first repetition unit, the secondrepetition unit, the third repetition unit, and the fourth repetitionunit by 4 is 3 (i.e., the number of PDSCHs corresponding to the HARQ-ACKis any one of 3, 7, 11, . . . ). If the value of a UL-DAI fieldindicates 3 (11_(b)), the UE may determine that the remainder obtainedby dividing the number of PDSCHs corresponding to the HARQ-ACKmultiplexed in the first repetition unit, the second repetition unit,the third repetition unit, and the fourth repetition unit by 4 is (i.e.,the number of PDSCHs corresponding to the HARQ-ACK is any one of 0, 4,8, . . . ). The number of PDSCHs corresponding to the HARQ-ACKmultiplexed in each repetition unit may differ. In addition, as shown inthe embodiment described with reference to FIG. 13, the UE may determinewhether or not to multiplex HARQ-ACK information with PUSCH transmissionin all of a plurality of repetition units in which PUSCH transmission isperformed. Even in this case, the UE may multiplex HARQ-ACK informationwith PUSCH transmission by applying the value of a UL-DAI field to everyrepetition unit in which HARQ-ACK information is multiplexed with PUSCHtransmission. Specifically, even if there is no PDSCH corresponding toHARQ-ACK information of PUCCH transmission in a specific repetitionunit, the UE may multiplex HARQ-ACK information with PUSCH transmissionin the corresponding repetition unit.

In the embodiment described above, the number of PDSCHs corresponding toeach of a plurality of PUCCH transmissions overlapping the PUSCHtransmission may differ. For example, PUSCH transmission may overlapPUCCH transmission in two slots. At this time, there may be 8 PDSCHscorresponding to HARQ-ACK information of a first PUCCH transmissionoverlapping the PUSCH transmission in the first slot, and there may be 5PDSCHs corresponding to HARQ-ACK information of a second PUCCHtransmission overlapping the PUSCH repetition transmission in the secondslot. If the value of a UL-DAI field of DCI for scheduling PUSCHtransmission indicates 4 (i.e., 11_(b)), the UE may determine that thereare 8 PDSCHs corresponding to the first PUCCH and that there are 8PDSCHs corresponding to the second PUCCH. In addition, the UE may failto receive DCI for scheduling a PDSCH corresponding to the HARQ-ACKinformation of the second PUCCH transmission overlapping the PUSCHrepetition transmission in the second slot. In this case, the UE maydetermine that the number of PDSCHs corresponding to the second PUCCH is4, which is less than 8. Accordingly, confusion may arise as to thenumber of PDSCHs of which the successful or unsuccessful reception isindicated by the HARQ-ACK information multiplexed with the PUSCHtransmission between the UE and the base station. Therefore, the UE mayconfigure the number of PDSCHs corresponding to HARQ-ACK information ofthe slot having the largest number of PDSCHs corresponding to theHARQ-ACK information, among the HARQ-ACK information of the PUCCHsoverlapping PUSCH transmission in a plurality of slots, as the number ofbits of all pieces of HARQ-ACK information multiplexed with PUSCHtransmission. The UE may configure the number of bits equal to that ofthe HARQ-ACK information of the slot having the largest number of bitsof HARQ-ACK information, among the HARQ-ACK information of the PUCCHsoverlapping PUSCH transmission in a plurality of slots, as the number ofbits of the HARQ-ACK information multiplexed with each PUSCHtransmission. In these embodiments, the UE may configure the bit of theHARQ-ACK information, in which the DCI scheduling the reception of acorresponding PDSCH is not received, as NACK. In these embodiments,since the base station is aware of the number of PDSCH transmissionsscheduled by the base station, the base station may estimate the numberof bits of the HARQ-ACK information corresponding to the successful orunsuccessful reception of the PDSCH transmission in each slot.Accordingly, these embodiments make it possible to prevent confusionregarding the number of PDSCHs of which the successful or unsuccessfulreception is indicated by the HARQ-ACK information multiplexed with thePUSCH transmission between the UE and the base station.

In the case where a PUSCH is repeatedly transmitted in one slot, theembodiments described above may be applied based on a repetition unitrather than a slot. The UE may configure the number of PDSCHscorresponding to HARQ-ACK information of the repetition unit having thelargest number of PDSCHs corresponding to the HARQ-ACK information,among the HARQ-ACK information of the PUCCHs overlapping the PUSCHtransmission in a plurality of repetition units, as the number of bitsof all pieces of HARQ-ACK information multiplexed with the PUSCHtransmission. The UE may configure the number of bits equal to that ofthe HARQ-ACK information of the repetition unit having the largestnumber of bits of HARQ-ACK information, among the HARQ-ACK informationof the PUCCHs overlapping the PUSCH transmission in a plurality ofrepetition units, as the number of bits of the HARQ-ACK informationmultiplexed with each PUSCH transmission. In these embodiments, the UEmay configure the bit of the HARQ-ACK information, in which the DCIscheduling the reception of a corresponding PDSCH is not received, asNACK.

In another specific embodiment, the UE may determine the value of a2-bit UL-DAI field to be information on the HARQ-ACK information of allPUCCH transmissions overlapping PUSCH transmission. Specifically, the UEmay determine that the value of a 2-bit UL-DAI field indicates theremainder obtained by dividing the sum of the numbers of PDSCHscorresponding to the HARQ-ACK information of all PUCCH transmissionsoverlapping PUSCH transmission by 4. For example, PUSCH transmission isperformed in 4 slots, and the numbers of PDSCHs corresponding to theHARQ-ACK information (or the number of bits of HARQ-ACK) of 4 PUCCHtransmissions overlapping the PUSCH transmission in the 4 slots are N1,N2, N3, and N4, respectively. At this time, the UE may determine thatthe value of a UL-DAI field of DCI for scheduling PUSCH transmissionindicates the value obtained by dividing N1+N2+N3+N4 by 4. If the valueof a UL-DAI field is 4 (i.e., 11_(b)), the UE may determine that theremainder obtained by dividing N1+N2+N3+N4 by 4 is 0. Accordingly, theUE may multiplex, with the PUSCH transmission, the HARQ-ACK informationindicating the successful or unsuccessful reception of a number ofPDSCHs corresponding to a multiple of 4.

In another specific embodiment, PUSCH transmission is performed in 4repetition units, and the numbers of PDSCHs corresponding to HARQ-ACKinformation (or the number of bits of HARQ-ACK) of 4 PUCCH transmissionsoverlapping the PUSCH transmission in the 4 repetition units are N1, N2,N3, and N4, respectively. At this time, the UE may determine that thevalue of a UL-DAI field of DCI for scheduling PUSCH transmissionindicates the value obtained by dividing N1+N2+N3+N4 by 4. If the valueof a UL-DAI field is 0 (i.e., 00_(b)), the UE may determine that theremainder obtained by dividing N1+N2+N3+N4 by 4 is 1. If the value of aUL-DAI field is 1 (i.e., 01_(b)), the UE may determine that theremainder obtained by dividing N1+N2+N3+N4 by 2 is 0. If the value of aUL-DAI field is 2 (i.e., 10_(b)), the UE may determine that theremainder obtained by dividing N1+N2+N3+N4 by 4 is 3. If the value of aUL-DAI field is 3 (i.e., 11_(b)), the UE may determine that theremainder obtained by dividing N1+N2+N3+N4 by 4 is 0. Accordingly, theUE may multiplex, with PUSCH transmission, the HARQ-ACK informationindicating the successful or unsuccessful reception of a number ofPDSCHs corresponding to a multiple of 4. As described above, when thebase station schedules PUSCH transmission in a plurality of slots, thebase station may schedule PUSCH transmission or PUCCH transmission sothat the number of slots in which the corresponding PUSCH transmissionand the PUCCH transmission overlap is less than or equal to a specificnumber. When PUSCH transmission is performed in a plurality of slots,the UE may assume that the corresponding PUSCH transmission and thePUCCH transmission may overlap in a specific number of slots or less.Here, the specific number may be 1. In this embodiment, the UE maydetermine that the value of a UL-DAI field of DCI for scheduling thePUSCH transmission indicates information on the number of bits of theHARQ-ACK information involved in PUCCH transmission in one slot in whichPUSCH transmission and PUCCH transmission overlap. Specifically, the UEmay determine that the value of a UL-DAI field of DCI for schedulingPUSCH transmission indicates the remainder obtained by dividing thenumber of bits of HARQ-ACK information involved in PUCCH transmission by4 in one slot in which PUSCH transmission and PUCCH transmissionoverlap. In the case where a PUSCH is repeatedly transmitted in oneslot, the base station may schedule PUSCH transmission or PUCCHtransmission such that the number of repetition units in which thecorresponding PUSCH transmission and the PUCCH transmission overlap isless than or equal to a specific number. At this time, the UE may assumethat the corresponding PUSCH transmission and the PUCCH transmission mayoverlap in a specific number of repetition units or less. Here, thespecific number may be 1. In this embodiment, the UE may determine thatthe value of a UL-DAI field of DCI for scheduling PUSCH transmissionindicates information on the number of bits of HARQ-ACK informationinvolved in PUCCH transmission in one repetition unit in which the PUSCHtransmission and the PUCCH transmission overlap. Specifically, the UEmay determine that the value of a UL-DAI field of DCI for schedulingPUSCH transmission indicates the remainder obtained by dividing thenumber of bits of HARQ-ACK information involved in PUCCH transmission by4 in one repetition unit in which the PUSCH transmission and the PUCCHtransmission overlap.

In another specific embodiment, if PUSCH transmission is performed in aplurality of slots, and if a HARQ-ACK codebook is configured, the numberof bits of a UL-DAI field may be determined according to the number ofslots in which PUSCH transmission is performed. Specifically, the numberof bits of a UL-DAI field may be proportional to the number of slots inwhich PUSCH transmission is performed. In a specific embodiment, if adynamic HARQ-ACK codebook is configured, the number of bits of a UL-DAIfield may be the value obtained by multiplying the number of slots, inwhich PUSCH transmission is performed, by 2. At this time, each of 2-bitsubfields of the UL-DAI field may indicate the remainder obtained bydividing the number of bits of the HARQ-ACK information multiplexed withPUSCH transmission by 4 in each slot in which PUSCH transmission isperformed. For example, if PUSCH transmission is configured to beperformed in 4 slots, and if a dynamic HARQ-ACK codebook is configured,the number of bits of a UL-DAI field may be 8. At this time, each of2-bit subfields of the UL-DAI field may indicate HARQ-ACK informationmultiplexed with PUSCH transmission in each of the 4 slots in whichPUSCH transmission is performed. In a specific embodiment, if asemi-static HARQ-ACK codebook is configured, the number of bits of aUL-DAI field may be the same as the number of slots in which PUSCHtransmission is performed. At this time, each bit of the UL-DAI fieldmay indicate whether or not HARQ-ACK information is multiplexed withPUSCH transmission in each slot in which PUSCH transmission isperformed. For example, if PUSCH transmission is configured to beperformed in 4 slots, and if a semi-static HARQ-ACK codebook isconfigured, the number of bits of a UL-DAI field may be 4. At this time,each bit of the UL-DAI field may indicate whether or not HARQ-ACKinformation is multiplexed with PUSCH transmission in each of the 4slots in which PUSCH transmission is performed.

In addition, if a PUSCH is repeatedly transmitted in one slot, thenumber of bits of a UL-DAI field may be determined according to thenumber of repetition units in which PUSCH transmission is performed.Specifically, the number of bits of a UL-DAI field may be proportionalto the number of repetition units in which PUSCH transmission isperformed. In a specific embodiment, if a dynamic HARQ-ACK codebook isconfigured, the number of bits of a UL-DAI field may be the valueobtained by multiplying the number of repetition units, in which PUSCHtransmission is performed, by 2. At this time, each of 2-bit subfieldsof the UL-DAI field may indicate the remainder obtained by dividing thenumber of bits of the HARQ-ACK information multiplexed with PUSCHtransmission by 4 in each repetition unit in which PUSCH transmission isperformed. For example, if PUSCH transmission is configured to beperformed in 4 repetition units, and if a dynamic HARQ-ACK codebook isconfigured, the number of bits of a UL-DAI field may be 8. At this time,each of 2-bit subfields of the UL-DAI field may indicate the HARQ-ACKinformation multiplexed with PUSCH transmission in each of the 4repetition units in which PUSCH transmission is performed. In a specificembodiment, if a semi-static HARQ-ACK codebook is configured, the numberof bits of a UL-DAI field may be the same as the number of repetitionunits in which PUSCH transmission is performed. At this time, each bitof the UL-DAI field may indicate whether or not HARQ-ACK information ismultiplexed with PUSCH transmission in each repetition unit in whichPUSCH transmission is performed. For example, if PUSCH transmission isconfigured to be performed in 4 repetition units, and if a semi-staticHARQ-ACK codebook is configured, the number of bits of a UL-DAI fieldmay be 4. At this time, each bit of the UL-DAI field may indicatewhether or not HARQ-ACK information is multiplexed with PUSCHtransmission in each of the 4 repetition units in which PUSCHtransmission is performed. In the above embodiments, it has beendescribed that the UE multiplexes HARQ-ACK information with PUSCHtransmission in a plurality of slots. The above-described embodiment maybe applied to the case where the UE multiplexes UCI (uplink controlinformation) with PUSCH transmission. UCI may include CSI/SR. The UE mayperform multiplexing of UCI in at least one of a plurality of slots inwhich PUSCH transmission is performed. When the UE multiplexes UCI withPUSCH transmission in a plurality of slots, the UE may configure thenumbers of bits of UCI to be the same. Specifically, when the UEmultiplexes UCI with PUSCH transmission in a plurality of slots, the UEmay configure the number of bits of all pieces of UCI multiplexed withPUSCH transmission as the maximum number of bits of UCI, among the UCImultiplexed with PUSCH transmission. At this time, the UE may pad 0 tothe UCI, thereby configuring the number of bits of all pieces of UCImultiplexed with PUSCH transmission as the maximum number of bits ofUCI, among the UCI multiplexed with PUSCH transmission. Specifically,the UE may add a bit indicating NACK to the HARQ-ACK information of UCI,thereby configuring the number of bits of the UCI multiplexed with PUSCHtransmission as the maximum number of bits of UCI, among the UCImultiplexed with PUSCH transmission. In addition, if a PUSCH isrepeatedly transmitted in one slot, the UE may perform multiplexing ofUCI in at least one of a plurality of repetition units in which PUSCHtransmission is performed. When the UE multiplexes UCI with PUSCHtransmission in a plurality of repetition units, the UE may determinethe numbers of bits of UCI to be the same. Specifically, when the UEmultiplexes UCI with PUSCH transmission in a plurality of repetitionunits, the UE may configure the number of bits of all pieces of UCImultiplexed with PUSCH transmission as the maximum number of bits ofUCI, among the UCI multiplexed with PUSCH transmission. At this time,the UE may pad 0 to the UCI, thereby configuring the number of bits ofall pieces of UCI multiplexed with PUSCH transmission as the maximumnumber of bits of UCI, among the UCI multiplexed with PUSCHtransmission. Specifically, the UE may add a bit indicating NACK to theHARQ-ACK information of UCI, thereby configuring the number of bits ofthe UCI multiplexed with PUSCH transmission as the maximum number ofbits of UCI, among the UCI multiplexed with the PUSCH transmission.

When the UE multiplexes UCI with PUSCH transmission in a plurality ofslots, the UE may dispose the UCI to the RE at the same position (or inthe same pattern) in all of the slots in which the UCI is multiplexed,thereby multiplexing the same. Specifically, the UE may transmit UCI inthe RE corresponding to the union of sets of REs corresponding to allpieces of UCI multiplexed with PUSCH transmission, and may transmit aPUSCH in the remaining REs.

In some of the embodiments described above, the UE may multiplexHARQ-ACK information with PUSCH transmission in the slot in which thePUCCH including HARQ-ACK information would not be transmitted if thePUSCH transmission were absent. At this time, the UE may multiplexHARQ-ACK information including only NACK with PUSCH transmission in theslot in which the PUCCH with HARQ-ACK information would not betransmitted if the PUSCH transmission were absent. Specifically, the UEmay multiplex valid HARQ-ACK information with PUSCH transmission in theslot that satisfies a PDSCH processing time. At this time, the UE maymultiplex HARQ-ACK information, in which successful or unsuccessfulreception of a corresponding PDSCH is configured as NACK, with the PUSCHtransmission in the slot that does not satisfy the PDSCH processingtime.

In addition, the UE may multiplex valid HARQ-ACK information with PUSCHtransmission in the slot indicated by the value of aPDSCH-to-HARQ_feedback timing indicator field of DCI for scheduling aPDSCH. At this time, the UE may multiplex HARQ-ACK information, in whichthe successful or unsuccessful reception of a corresponding PDSCH isconfigured as NACK, with PUSCH transmission in the slots other than theslot indicated by the value of a PDSCH-to-HARQ_feedback timing indicatorfield of DCI for scheduling a PDSCH. In another specific embodiment, theUE may multiplex valid HARQ-ACK information with PUSCH transmission inthe slot indicated by the value of a PDSCH-to-HARQ_feedback timingindicator field of DCI for scheduling a PDSCH and in the slotssubsequent thereto. At this time, the UE may multiplex HARQ-ACKinformation, in which the successful or unsuccessful reception of acorresponding PDSCH is configured as NACK, with PUSCH transmission inthe slots before the slot indicated by the value of aPDSCH-to-HARQ_feedback timing indicator field of DCI for scheduling aPDSCH.

In the embodiment described with reference to FIG. 12, if a PDCCH or aPDSCH satisfying the HARQ-ACK timing is not received for a specificslot, the UE does not multiplex HARQ-ACK information with PUSCHtransmission in the corresponding slot. In another specific embodiment,the UE may multiplex HARQ-ACK information with PUSCH transmission in theslot indicated by a PDSCH-to-HARQ_feedback timing indicator field of DCIfor scheduling a PDSCH. At this time, the UE may multiplex HARQ-ACKinformation, in which the successful or unsuccessful reception of acorresponding PDSCH is configured as NACK, with PUSCH transmission inthe slot other than the slot indicated by DCI for scheduling the PDSCHusing the value of a PDSCH-to-HARQ_feedback timing indicator.

In the embodiment described with reference to FIG. 13, the HARQ-ACKinformation multiplexed with PUSCH transmission in a subsequent slotdoes not indicate the successful or unsuccessful reception of a PDSCH ofwhich the successful or unsuccessful reception is indicated by theHARQ-ACK information multiplexed with PUSCH transmission in a previousslot. In another specific embodiment, the HARQ-ACK informationmultiplexed with PUSCH transmission in a subsequent slot may indicatethe successful or unsuccessful reception of the PDSCH, of which thesuccessful or unsuccessful reception is indicated by the HARQ-ACKinformation multiplexed with PUSCH transmission in a previous slot,using NACK.

In addition, when the UE calculates the number of bits of HARQ-ACKinformation in order to determine whether or not multiplexing isrequired, the UE may exclude the HARQ-ACK information configured as NACKfrom the calculation of the number of bits of HARQ-ACK regardless of thesuccessful or unsuccessful reception of a PDSCH as shown in theembodiments described above. For example, if the total number of bits ofHARQ-ACK information multiplexed with PUSCH transmission by the UE is A,and if the number of bits configured as NACK regardless of thesuccessful or unsuccessful reception of a PDSCH is B, the UE maydetermine the number of bits of valid HARQ-ACK information to bemultiplexed with PUSCH transmission on the basis of A-B. The UE maydetermine the amount of resources to be multiplexed with PUSCHtransmission using the number of bits of valid HARQ-ACK information. Theamount of resources to be multiplexed may indicate the number of REs fortransmitting HARQ-ACK information. The amount of resources to bemultiplexed may increase in proportion to the value of A-B. Morespecifically, if a target code rate for transmission of HARQ-ACKinformation is configured as “a”, the number of REs transmittingHARQ-ACK information may be (A−B)/(Modulation_order*a). Here,“Modulation_order” represents the modulation order of HARQ-ACKinformation multiplexed with the PUSCH. For example, if A-B is 0, sincethere is no valid HARQ-ACK information, the UE may not multiplexHARQ-ACK information with PUSCH transmission.

As described above, if PUCCH transmission with HARQ-ACK informationoverlaps PUSCH transmission in the time domain, the UE may multiplexHARQ-ACK information with PUSCH transmission. In addition, if PUCCHtransmission with HARQ-ACK information overlaps another PUCCHtransmission in the time domain, the UE may multiplex HARQ-ACKinformation with another PUCCH transmission. When the UE multiplexesHARQ-ACK information with PUSCH transmission or another PUCCHtransmission in any one slot, if processing timing conditions for aPDSCH of which the successful or unsuccessful reception is indicated byHARQ-ACK and a PDCCH for scheduling PUCCH transmission includingHARQ-ACK are satisfied, the UE may perform multiplexing. This will bedescribed with reference to FIGS. 16 to 18.

FIG. 16 illustrates a method in which a UE determines whether or notmultiplexing of HARQ-ACK information is enabled on the basis of thelatest symbol of a PDSCH of which the successful or unsuccessfulreception is indicated by HARQ-ACK information and the latest symbol ofa PDCCH for scheduling a PUCCH including HARQ-ACK information whenmultiplexing HARQ-ACK information with PUSCH transmission according toan embodiment of the present invention.

The UE may multiplex HARQ-ACK information with physical channeltransmission on the basis of the position of the latest symbol of aPDSCH of which the successful or unsuccessful reception is indicated byHARQ-ACK information and the position of the earlier symbol of the startsymbol of a PUCCH including HARQ-ACK information and the start symbol ofphysical channel transmission used in multiplexing of HARQ-ACKinformation. If the earlier symbol of the first symbol of a PUCCHincluding HARQ-ACK information and the first symbol of another PUCCH ispositioned behind the latest symbol of a PDSCH, of which the successfulor unsuccessful reception is indicated by HARQ-ACK information, by N₁⁺+d_(1,1)+d_(1,2) symbols or more, the UE may transmit HARQ-ACKinformation through the PUCCH. If the earlier symbol of the first symbolof a PUCCH including HARQ-ACK information and the first symbol of aPUSCH is positioned behind the latest symbol of a PDSCH, of which thesuccessful or unsuccessful reception is indicated by HARQ-ACKinformation, by N₁ ⁺+d_(1,1)+d_(1,2) symbols or more, the UE maytransmit HARQ-ACK information through the PUSCH. At this time, N₁ ⁺ isN₁+1. The value N₁ follows Table 4.

TABLE 4 PDSCH decoding time N₁ [symbols] dmrs-AdditionalPosition =dmrs-Additional pos0 in Position ≠ pos0 in DMRS-DownlinkConfigDMRS-DownlinkConfig in either of dmrs- in either of dmrs-DownlinkForPDSCH- DownlinkForPDSCH- MappingTypeA, dmrs- MappingTypeA,dmrs- DownlinkForPDSCH- DownlinkForPDSCH- μ MappingTypeB MappingTypeB 08 13 1 10 13 2 17 20 3 20 24

In Table 4, “μ” is one of the subcarrier spacing values of a PDCCH orthe subcarrier spacing values of a UL BWP through which HARQ-ACKinformation is transmitted, and may be the value that maximizesT_(proc,1). T_(proc,1) may indicate the minimum time required for the UEto receive a PDSCH and produce valid HARQ-ACK for the correspondingPDSCH. Specifically, T_(proc,1) may be determined according to thefollowing equation.

T _(proc,1)=((N ₁ +d _(1,1) +d _(1,2))(2048+144)·κ2^(μ))·T _(C)

In addition, d_(1,1) is 0 if HARQ-ACK information is transmitted througha PUCCH, and is 1 if HARQ-ACK information is transmitted through aPUSCH. With regard to d_(1,2), if the PDSCH mapping type is A, and ifthe latest symbol of a PDSCH is the i^(th) symbol before the 7th symbol,it may be d_(1,2)=7−i. If the PDSCH mapping type is B, and if the lengthof a PDSCH is 4 symbols, it may be d_(1,2)=3. If the length of a PDSCHis 2 symbols, it may be d_(1,2)=3+d. At this time, “d” is the number ofsymbols in which the PDSCH, the PDSCH, and PDCCH overlap. The mappingtype of a PDSCH may be indicated by DCI. The position of a first DMRS ofa PDSCH may be determined according to the mapping type of the PDSCH.Specifically, if the mapping type of a PDSCH is A, the position of afirst DMRS of the PDSCH is fixed in a slot. In addition, if the mappingof a PDSCH is B, a first DMRS of the PDSCH starts at the first symbol ofa scheduled PDSCH.

The UE may multiplex a HARQ-ACK channel with physical channeltransmission on the basis of the position of the latest symbol of aPDCCH for scheduling transmission of a PUCCH including HARQ-ACKinformation and the position of the earlier symbol of the start symbolof a PUCCH including HARQ-ACK information and the start symbol of thecorresponding physical channel transmission. Specifically, if theearlier symbol of the start symbol of a PUCCH including HARQ-ACKinformation and the start symbol of another PUCCH is positioned behindthe latest symbol of a PDCCH for scheduling transmission of a PUCCHincluding HARQ-ACK information by N₂++d_(2,1) symbols or more, the UEmay transmit HARQ-ACK information through the PUCCH. If the earliestsymbol of the PUSCH is positioned behind the latest symbol of a PDCCHfor scheduling the corresponding PUSCH by N₂ ⁺+d_(2,1) symbols or more,the UE may transmit HARQ-ACK information through the PUCCH. N₂ ⁺ isN₂+1. The value N₂ follows Table 5.

TABLE 5 μ PUSCH preparation time N₂ [symbols] 0 10 1 12 2 23 3 36

In the embodiment in FIG. 16, the symbol interval between the latestsymbol of a PDSCH of which the successful or unsuccessful reception isindicated by HARQ-ACK information and the earlier symbol (referencepoint) of the first symbol of a PUCCH including HARQ-ACK information andthe first symbol of a PUSCH satisfies the conditions described above. Inaddition, the symbol interval between the latest symbol of a PDCCHscheduling PUSCH transmission and the earlier symbol of the first symbolof a PUCCH including HARQ-ACK information and the first symbol of aPUSCH satisfies the conditions described above. Therefore, the UEmultiplexes HARQ-ACK transmission with PUSCH transmission. In addition,in these embodiments, the UE may not expect that the PUSCH transmissionand PUCCH transmission, which do not satisfy the condition describedabove, overlap.

If a semi-static HARQ-ACK codebook is configured, DCI for scheduling aPDSCH may indicate the HARQ-ACK timing through a PDSCH-to-HARQ_feedbacktiming indicator field. The HARQ-ACK timing indicates the slot intervalbetween the PDSCH transmission and the PUCCH transmission includingHARQ-ACK information indicating the successful or unsuccessful receptionof the corresponding PDSCH. The HARQ-ACK timing is configured withoutconsideration of the above-described conditions related to the latestsymbol of a PDSCH. Therefore, there may be a problem in the case wherethe PDSCH of which the successful or unsuccessful reception is indicatedby the HARQ-ACK information indicated by the HARQ-ACK timing does notsatisfy the condition related to the latest symbol of a PDSCH. This isdue to the fact that the UE is unable to multiplex HARQ-ACK information,including the successful or unsuccessful reception of a PDSCH indicatedby the HARQ-ACK timing, with PUSCH transmission or PUCCH transmission.This will be described with reference to FIG. 17.

FIG. 17 illustrates a method in which a UE performs multiplexing ofHARQ-ACK information on the basis of HARQ-ACK timing and the latestsymbol of a PDSCH of which the successful or unsuccessful reception isindicated by HARQ-ACK information when multiplexing HARQ-ACK informationwith PUSCH transmission according to an embodiment of the presentinvention

If a PDSCH of which the successful or unsuccessful reception isindicated by HARQ-ACK information does not satisfy the above-describedconditions related to the latest symbol of a PDSCH by the HARQ-ACKtiming, the UE may determine the successful or unsuccessful reception ofthe PDSCH to be NACK in the HARQ-ACK information regardless of thesuccessful or unsuccessful reception of the corresponding PDSCH. Thebase station may expect that the successful or unsuccessful reception ofthe PDSCH is configured as NACK in the HARQ-ACK information.

As described above, the conditions related to the latest symbol of thePDSCH may indicate that the earlier symbol of the first symbol of aPUCCH including HARQ-ACK information and the first symbol of anotherPUCCH is positioned behind the latest symbol of a PDSCH, of which thesuccessful or unsuccessful reception is indicated by HARQ-ACKinformation, by N₁ ⁺+d_(1,1)+d_(1,2) symbols or more.

In the embodiment in FIG. 17, the PDSCHs indicated by the HARQ-ACKtiming are a first PDSCH (PDSCH #1) and a second PDSCH (PDSCH #2). Theinterval between a preceding symbol (reference point) among the latestsymbol of the PDSCH in which reception success is indicated by theHARQ-ACK information, the first symbol of the PUCCH including HARQ-ACKinformation, and the first symbol of the PUSCH and the latest symbol ofthe first PDSCH (PDSCH #1) is greater than N₁ ⁺+d_(1,1)+d_(1,2). Inaddition, the interval between a preceding symbol(reference point) amongthe latest symbol of the PDSCH in which reception success is indicatedby the HARQ-ACK information, the first symbol of the PUCCH includingHARQ-ACK information, and the first symbol of the PUSCH and the latestsymbol of the second PDSCH (PDSCH #2) is less than N₁ ⁺+d_(1,1)+d_(1,2).In addition, the symbol interval between the latest symbol of a PDCCHscheduling the PUSCH transmission and the earlier symbol of the firstsymbol of a PUCCH including HARQ-ACK information and the first symbol ofa PUSCH is greater than N₂+d_(2,1). Therefore, the UE may multiplexHARQ-ACK information, in which whether the second PDSCH (PDSCH #2) issuccessfully received is set to NACK and whether the first PDSCH (PDSCH#1) is successfully received is set according to whether the first PDSCH(PDSCH #1) is successfully received, to PUSCH transmission.

In another specific embodiment, if a PDSCH of which the successful orunsuccessful reception is indicated by HARQ-ACK information does notsatisfy the above-described conditions related to the latest symbol of aPDSCH by the HARQ-ACK timing, the UE may not multiplex HARQ-ACKinformation indicating the successful or unsuccessful reception of thecorresponding PDSCH with physical channel transmission. In theembodiment in FIG. 17, the UE may multiplex HARQ-ACK informationindicating the successful or unsuccessful reception of the first PDSCH(PDSCH #1) with the PUSCH, and may not multiplex the HARQ-ACKinformation indicating the successful or unsuccessful reception of thesecond PDSCH (PDSCH #2) with the PUSCH. In this embodiment, the UE doesnot transmit invalid HARQ-ACK information, thereby reducing the size ofUL overhead.

FIG. 18 illustrates a method in which a UE performs multiplexing ofHARQ-ACK information on the basis of T_(proc,1) and the latest symbol ofa PDSCH of which the successful or unsuccessful reception is indicatedby HARQ-ACK information when multiplexing HARQ-ACK information withPUSCH transmission according to another embodiment of the presentinvention.

The UE may not determine the above-described conditions related to thelatest symbol of a PDSCH for the PDSCH corresponding to invalid HARQ-ACKinformation. The UE may determine the HARQ-ACK information, which doesnot satisfy a T_(proc,1) condition, to be invalid HARQ-ACK information.At this time, the T_(proc,1) condition may indicate that the intervalbetween the latest symbol of a PDSCH of which the successful orunsuccessful reception is indicated by HARQ-ACK information and theearliest symbol of a PUCCH including HARQ-ACK information is greaterthan T_(proc,1). In addition, T_(proc,1) may follow the equationdescribed above. Specifically, Specifically, the UE may determineHARQ-ACK information indicating whether or not the PDSCH located betweenthe earliest symbol of PUCCH including HARQ-ACK, and T_(proc,1) previoussymbol is successfully received as invalid HARQ-ACK information. This isdue to the fact that the HARQ-ACK information, which does not satisfythe T_(proc,1) condition, is configured as NACK.

In the embodiment in FIG. 18, the interval between the latest symbol ofa first PDSCH (PDSCH #1) and the earliest symbol of a PUCCH includingHARQ-ACK is greater than T_(proc,1). In addition, the interval betweenthe latest symbol of a second PDSCH (PDSCH #2) and the earliest symbolof a PUCCH including HARQ-ACK is less than T_(proc,1). In addition, thesymbol interval between the latest symbol of a PDCCH scheduling PUSCHtransmission and the earlier symbol of the earliest symbol of a PUCCHincluding HARQ-ACK information and the earliest symbol of a PUSCH isgreater than N₂+d_(2,1). Therefore, the successful or unsuccessfulreception of the second PDSCH (PDSCH #2) may be configured as NACK, andthe UE may multiplex HARQ-ACK information, which is configured accordingto the successful or unsuccessful reception of the first PDSCH (PDSCH#1), with PUSCH transmission by the successful or unsuccessful receptionof the first PDSCH (PDSCH #1). In addition, the UE may not determine theabove-described conditions related to the latest symbol of a PDSCH forthe second PDSCH (PDSCH #2).

In another specific embodiment, the UE may multiplex the remaining,excluding invalid HARQ-ACK information from the HARQ-ACK information ofPUCCH transmission overlapping PUSCH transmission, with physical channeltransmission. The UE may multiplex the remaining, excluding the HARQ-ACKinformation that does not satisfy the T_(proc,1) condition from theHARQ-ACK information of PUCCH transmission overlapping PUSCHtransmission, with physical channel transmission. According to theembodiment in FIG. 18, the UE may multiplex only the HARQ-ACKinformation indicating the successful or unsuccessful reception of thefirst PDSCH (PDSCH #1) with PUSCH transmission, excluding the HARQ-ACKinformation indicating the successful or unsuccessful reception of thesecond PDSCH (PDSCH #2). The UE may reduce the size of UL overheadthrough this embodiment.

In the embodiments described above, the UE may determine the conditionsrelated to the latest symbol of a PDSCH only for the PDSCH indicated bythe PDCCH of which the reception is successful. If a semi-staticHARQ-ACK codebook is configured, the semi-static HARQ-ACK codebook mayinclude HARQ-ACK information indicating the successful or unsuccessfulreception of the PDSCH indicated by the PDCCH of which the reception isnot successful or the PDSCH indicated by the PDCCH that the base stationhas not transmitted. At this time, the UE may determine the conditionsrelated to the latest symbol of a PDSCH only for the PDSCH indicated bythe PDCCH of which the reception is successful. This is due to the factthat the UE does not receive the PDSCH indicated by the PDCCH of whichthe reception is not successful.

In addition, in the embodiments described above, the value d_(1,1) maybe fixed to the maximum value available to d_(1,1). In addition, thevalue d_(1,2) may be fixed to the maximum value available to d_(1,2).This is due to the fact that the UE is not aware of value d_(1,1) andthe value d_(1,2) if the PDCCH scheduling a PDSCH is not received. Inthe embodiments above, d_(1,1) may be 1. In addition, d_(1,2) may be 6or 5.

In the embodiments described above, the physical data channel mayinclude a PDSCH or a PUSCH. In addition, the physical control channelmay include a PDCCH or a PUCCH. In addition, the embodiments in which aPUSCH, a PDCCH, a PUCCH, and a PDCCH are described by way of example maybe applied to other types of data channels and control channels.

Although the method and the system of the present invention have beendescribed in connection with specific embodiments, some or all of theelements or operations thereof may be implemented using a computingsystem having general-purpose hardware architecture.

The above description of the present invention is provided only asexamples, and those of ordinary skill in the art will be able tounderstand that the present invention can be easily modified into otherspecific forms without changing the technical spirit or essentialfeatures of the present invention. Therefore, it should be understoodthat the embodiments described above are illustrative in all respectsand are not intended to limit the present invention. For example, therespective elements described as a single type may be implemented inseparate forms, and similarly, the elements described as being separatemay also be implemented in an integrated form.

The scope of the present invention is indicated by the claims to bedescribed later rather than the detailed description above, and allchanges or modified forms derived from the meaning and scope of theclaims and their equivalent concepts should be interpreted as beingincluded in the scope of the present invention.

1-20. (canceled)
 21. A user equipment in a wireless communicationsystem, the user equipment comprising: a communication module; and aprocessor configured to control the communication module, wherein theprocessor is configured to, receive control information of a physicaldownlink control channel (PDCCH) for scheduling transmission of aphysical uplink shared channel (PUSCH) in multiple slots, identify anumber of PDSCHs to transmit an hybrid automatic repeatrequest(HARQ)-acknowledgement(ACK) information in each of at least oneslot among the multiple slots according to a specific value indicated bya downlink assignment index(DAI) field of the control information, andtransmit the PUSCH in the multiple slots, wherein the HARQ-ACKinformation is multiplexed with the PUSCH in the at least one slot amongthe multiple slots, and wherein the at least one slot is determinedaccording to whether the HARQ-ACK information is multiplexed in thePUSCH transmission for each of the multiple slots.
 22. The userequipment of claim 21, wherein the HARQ-ACK information is multiplexedto the PUSCH transmission in each of the at least one slot by applyingthe same value of the DAI field included in the DCI.
 23. The userequipment of claim 21, wherein the specific value is ‘1’ when 2 bits ofthe DAI field are ‘00’, wherein the specific value is ‘2’ when 2 bits ofthe DAI field are ‘01’, wherein the specific value is ‘3’ when 2 bits ofthe DAI field are ‘10’, and wherein the specific value is ‘4’ when 2bits of the DAI field are ‘11’.
 24. The user equipment of claim 21,wherein the at least one slot is determined by excluding one or moreslots satisfying a specific condition in which HARQ-ACK cannot bemultiplexed for PUSCH transmission in the plurality of slots.
 25. Theuser equipment of claim 24, wherein the specific condition is that thereis no PUSCH transmission in the one or more slots, a PDSCH in the one ormore slots is not received, or the PDCCH scheduling transmission of thePUCCH including HARQ-ACK information in the one or more slots is notreceived, and wherein whether the reception of the PDSCH is successfulis indicated by the HARQ-ACK information.
 26. The user equipment ofclaim 21, wherein a slot, which is not indicated by aPDSCH-to-HARQ_feedback timing indicator field in the control informationscheduling a PDSCH, among the at least one slot is multiplexed with theHARQ-ACK information in which the HARQ-ACK information of the PDSCH isset to NACK in the PUSCH transmission.
 27. The user equipment of claim21, wherein the HARQ-ACK information is multiplexed to the PUSCH in theat least one slot according to whether the at least one slot satisfies aprocessing timing condition of the PDCCH for scheduling transmission ofa PDSCH and a PUCCH including the HARQ-ACK information, wherein whetherthe reception of the PDSCH is successful is indicated by the HARQ-ACKinformation, and wherein the processing timing condition is determinedaccording to a minimum time required for the user equipment to receivethe PDCCH and to generate valid HARQ-ACK information.
 28. The userequipment of claim 27, wherein the HARQ-ACK information is notmultiplexed to the PUSCH in the at least one slot when the at least oneslot does not satisfy the processing timing condition.
 29. The userequipment of claim 27, wherein the HARQ-ACK information corresponding tothe PDSCH that does not satisfy the processing timing condition is setto NACK.
 30. The user equipment of claim 27, wherein the processingtiming condition is determined on the basis of the position of thelatest symbol of the PDSCH of which the successful or unsuccessfulreception is indicated by the HARQ-ACK information and the position ofthe earlier symbol of a start symbol of a PUCCH including the HARQ-ACKinformation and a start symbol of PUSCH transmission over the pluralityof slots.
 31. A method of operating a user equipment in a wirelesscommunication system, the method comprising: receiving controlinformation of a physical downlink control channel (PDCCH) forscheduling transmission of a physical uplink shared channel (PUSCH) inmultiple slots; identifying a number of PDSCHs to transmit an hybridautomatic repeat request(HARQ)-acknowledgement(ACK) information in eachof at least one slot among the multiple slots according to a specificvalue indicated by a downlink assignment index(DAI) field of the controlinformation; and transmitting the PUSCH in the multiple slots, whereinthe HARQ-ACK information is multiplexed with the PUSCH in the at leastone slot among the multiple slots, and wherein the at least one slot isdetermined according to whether the HARQ-ACK information is multiplexedin the PUSCH transmission for each of the multiple slots.
 32. The methodof claim 31, wherein the HARQ-ACK information is multiplexed to thePUSCH transmission in each of the at least one slot by applying the samevalue of the DAI field included in the DCI.
 33. The method of claim 31,wherein the specific value is ‘1’ when 2 bits of the DAI field are ‘00’,wherein the specific value is ‘2’ when 2 bits of the DAI field are ‘01’,wherein the specific value is ‘3’ when 2 bits of the DAI field are ‘10’,and wherein the specific value is ‘4’ when 2 bits of the DAI field are‘11’.
 34. The method of claim 31, wherein the at least one slot isdetermined by excluding one or more slots satisfying a specificcondition in which HARQ-ACK cannot be multiplexed for PUSCH transmissionin the plurality of slots.
 35. The method of claim 34, wherein thespecific condition is that there is no PUSCH transmission in the one ormore slots, a PDSCH in the one or more slots is not received, or thePDCCH scheduling transmission of the PUCCH including HARQ-ACKinformation in the one or more slots is not received, and whereinwhether the reception of the PDSCH is successful is indicated by theHARQ-ACK information.
 36. The method of claim 31, wherein a slot, whichis not indicated by a PDSCH-to-HARQ_feedback timing indicator field inthe control information scheduling a PDSCH, among the at least one slotis multiplexed with the HARQ-ACK information in which the HARQ-ACKinformation of the PDSCH is set to NACK in the PUSCH transmission. 37.The method of claim 31, wherein the HARQ-ACK information is multiplexedto the PUSCH in the at least one slot according to whether the at leastone slot satisfies a processing timing condition of the PDCCH forscheduling transmission of a PDSCH and a PUCCH including the HARQ-ACKinformation, wherein whether the reception of the PDSCH is successful isindicated by the HARQ-ACK information, and wherein the processing timingcondition is determined according to a minimum time required for theuser equipment to receive the PDCCH and to generate valid HARQ-ACKinformation.
 38. The method of claim 37, wherein the HARQ-ACKinformation is not multiplexed to the PUSCH in the at least one slotwhen the at least one slot does not satisfy the processing timingcondition.
 39. The method of claim 37, wherein the HARQ-ACK informationcorresponding to the PDSCH that does not satisfy the processing timingcondition is set to NACK.
 40. The method of claim 37, wherein theprocessing timing condition is determined on the basis of the positionof the latest symbol of the PDSCH of which the successful orunsuccessful reception is indicated by the HARQ-ACK information and theposition of the earlier symbol of a start symbol of a PUCCH includingthe HARQ-ACK information and a start symbol of PUSCH transmission overthe plurality of slots.